Specifications

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Little Board/486i Technical Manual

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3.11.2 Byte-Wide Socket Signals

Jumper arrays W14 (for S0), W15 (for S1) configure the byte-wide sockets for specific memory devices.

In addition, jumpers W2, W21, control backup battery to S0 for use with SRAMs.

The following table list the signals that appear on the pins of W14 and W15.

W14/W15

Signal

Name Description

1 -- No connection

2 Vpp Programming power for Flash devices

3 -- No connection

4 A18 Address A18 (static)

5 Pin 3 Connection to pin 3 of the byte-wide socket

6 A19 Address A19 (static)

7 Pin 33 Connection to pin 33 of the byte-wide socket

8 -SMEMR Write strobe

9 Pin 31 Connection to pin 31 of the byte-wide socket

10 A15 Address SA15 from the expansion bus

11 Pin 5 Connection to pin 5 of the byte-wide socket

12 A14 Address SA14 from the expansion bus

13 A17 Address A17 (static)

14 Pin 32 Connection to pin 32 of the byte-wide socket

15 Vcc or

backup

battery

Connected to the center pin of W21. W21-1

connects to the backup battery; W21-3 connects to

+5V.

Table 3-12 Byte-Wide Jumper Pin Signals (W14, W15)

3.11.3 Flash EPROM Programming

To program Flash devices, use the FLASHWRI utility supplied on the Common Utilities diskette. The

Common Utilities manual describes its operation.

Programming power is handled automatically for both 5V and 12V Flash devices. The board provides

12V power for programming 12V Flash EPROMs. There are no jumpers to set, as the onboard 12V Flash

programming supply is controlled by software.

Note that there is a 5 mS delay for the 12V Flash programming supply to come up to its full voltage after

being switched on by software. Refer to Ampro Application Note AAN-9210 for information about the

extended BIOS call provided for Flash programming power control.

3.11.4 Battery Backup for SRAMs

To connect the onboard battery (and external battery, if installed on J16) to byte-wide socket S0 to

backup an SRAM, install jumpers on W2 and W21-1/2. Read the section “Backup Battery” in Chapter 2

to calculate the battery life of the backup battery.