JPS63239572A - Memory card device - Google Patents

Abstract

PURPOSE:To detect an unconnected terminal by indicating that all terminals are connected when test data to be written on a memory card are stored in specified addresses having specified data values. CONSTITUTION:Data is transferred to the memory card 11 by using the input/ output port 9 of a microprocessor MCU 8 incorporated in a reader writer 7 as a data bus and the output port 10 as an address bus. The memory card 11 has a pull-up circuit 13 at a terminal 12 and data is written in and read out of a RAM 16 through an address bus 14 and a data bus 15. The pull-up circuit 13, therefore, detects an unconnected terminal until all terminals of the address bus 14 and data bus 15 are connected correctly. Thus, the connection state of the terminals of the memory card and reader/writer can be checked.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a memory card device having a function of checking the connection status of the address bus and data bus terminals of a memory card and a reader/writer.

2. Description of the Related Art In a conventional memory card device, as shown in FIG. The pull-down circuits are set to ft@, the connected input/output terminals 3o are set to 1 (ul, hll), and the unconnected input/output terminals 31 are set to "LOW". Reading was confirmed at output port 33.

Problems to be Solved by the Invention In such conventional memory card devices, high-resistance pull-down circuits are installed at the input/output terminals of the reader/writer in order to check the connection status of each terminal of the address bus and data bus. Moreover, in order to read the connection status, there was a problem in that it was necessary to use an MOU 32 that had a port that could not only output but also input.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention aims to solve the above problems by transmitting test data sent through the address bus and data bus of the reader/writer to the memory when the reader/writer is connected to the memory card. The connection status of each terminal is checked by checking whether the specified data value has been written to the specified address of the card.

According to the above-described configuration, the present invention indicates that all terminals are connected if the test data written to the memory card has the specified data value correctly entered at the specified address. If the address address is different or the data value is different, an unconnected terminal is detected from the different situation.

Embodiment FIG. 1 is a block diagram showing an embodiment of a memory card device of the present invention. MC built into reader/writer 7
Connect input/output port 9 of U3 to data bus, output port 10
is used as an address bus to transfer data to and from the memory card 11. In the memory card 11, a pull-up circuit 13 is placed at a terminal 12, and data is read and written into the RAM 16 through an address bus 14 and a data bus 16.

FIGS. 2 and 3 are block diagrams for checking the connection status of the data bus. Figure 2 shows the data bus 17
This is the case where all of the bits are connected correctly, and FIG. 3 shows the case where the data bus 18 of bit 2 is not connected correctly. First, an arbitrary address (hereinafter referred to as m address) V of the memory card 11 from the reader/writer 7 shown in C1L)
Write the value of cooH. Next, the data bus input/output port register 21 of the soda lighter T shown in (b) is
Write the value of FH. Finally, memory card 1 shown in (0)
The data value written at address 10m is sent to reader/writer 7.
The connection status is determined by reading the value and checking the value. At this time, if the data bus 1T in Figure 2 is connected correctly, the data value 00H written to the memory card 11 is read out as is, but if the data bus 18 in Figure 3 is connected correctly. If not, the reader
When writing OOH from the writer 7 to the memory card 11,
Only the unconnected bit (bit 2 in this case).

The pull-up circuit 13 of the memory card 11 is
"1" is written to that bit of the pm address in "h". Next, the input/output port register 21 of the reader/writer 7
After writing ``1'' to all bits, when reading the data value at address m from the memory card 11 to the reader/writer 7, the connected bits are read, but the unconnected bits are read out from the memory card. Since no data value is input from 11, that bit does not change.As a result, only the unconnected bit is confirmed as "1" (bit 2 in this case). Figures 4 and 6 show the block diagram for checking the address bus connection status. This is a diagram.

Figure 4 shows the case where all address buses 22 are connected correctly, and Figure 6 shows the case where address bus 22 is connected correctly for bit 1.
3 is not connected. First, the value 01H is written to address 02H of the memory card 11 from the reader/writer 7 shown in (a). Next, the value of OOH address Vc00H of the memory card 11 shown in (b) is written. Finally (0
) from the memory card 11 to the reader/writer 7.
By reading the value of address 2H and checking the value, the connection status of bit 1 of the address bus is determined. At this time, if the address bus 22 in FIG. 4 is connected correctly, the specified data value (in this case, 01H to address 02H and OOH to address OOH) is written to the specified address. Bit 1 of address bus 23 in FIG.
is not connected correctly, OOH in Cb)
Even though data writing is specified at the address, the pull-up circuit of the memory card 11 causes the specified address to become 02H and the data value is rewritten from OlH to OOH. As a result, in p (C), if the positive side is connected, 01H is read as the data value, and if it is not connected, 00)I is read out as the data value. The connection status of No. 1 is determined.

Similarly, the connection status of bits of other address buses is determined.

Effects of the Invention As described above, according to the present invention, the connection status between the memory card and the terminal of the reader/writer can be checked with an extremely simple configuration, and accurate data can be transferred to the memory card. become.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a memory card device according to an embodiment of the present invention, FIG. 2 is a block diagram when all data buses of the memory card device are connected, and FIG. 3 is a block diagram showing the data buses of pit 2. Figure 4 is a block diagram when all address buses of the memory card device are connected. Figure 6 is a block diagram when the address bus for bit 1 is not connected. FIG. 6 is a block diagram of a conventional memory device. - 7...Reader/writer, 8...MCU for reader/writer, 9...Data input/output port. 10...Address input/output port, 11...
...Memory card, 12...Memory card input/output terminal, 13...Pull-up circuit, 14
, 22, 23...address bus, 15, 1
7.18...cheetah bus, 16...
fiA]il, 21... Input/output port register. . Name of agent: Patent attorney Toshio Nakao and 1 other person7-
-・Leaf: Writer δ-MCU? ---Input/output tree for theta 1O---Insushi power for Atotos, Odo Y /f---~Memory card tt'----No. Falatsua Kai 14--Ichiryo Dorenu Bus I5-/Chi-7 Bus No. 1 Figure 1b-1 Shakuha H7-
--All 14 steps ahead S8-r'-Tahanu 11--- +
Leak Lighter No. 3 Figure 7 - Leak Lighter 7 - Leak Lighter? 4---Memosocar F? 6---Human output Jl) (Memory sword z6---Low 4
30 -11 shoulder + Izu 8 to 3r--Ichibohiki F Heyomito

Claims (1)

[Claims] A memory card has a circuit that pulls up all input/output terminals of an address bus and a data bus, an output-only port is used as an address bus, and an input/output-only port is used as a data bus, and the input/output data is used as a memory card. A memory card device consisting of a reader/writer with a built-in microprocessor (hereinafter abbreviated as MCU) that has a program to check the connection status of terminals.