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GL310MC3D

PS/2 3D Mouse Controller

Genesys Logic 

GL310MC PS/2 3D Mouse Controller

CLK1

CLK2

Request-to-send

Bit0

Bit1

t5

t6

t7

CLK9

CLK10

CLK11

Bit7

Parity bit

Stop bit Line control

t8

t9

t10

t11 t12

Figure 4-3. PS/2 output waveforms

In Figure 4-3, the CLK signal is low for 30-50µs (t6) and high for 30-50µs (t7) in each bit cell.

DATA is sampled when CLK is high, and must be valid no later than 1µs after the rising edge of

the clock (t8>-1µs. t9>= 0µs). In the line control bit, DATA goes low at least 5µs before the

falling edge (t10) and stays low at least 5µs after the rising edge (t11) of the clock.

For each command or argument byte that requires a response, the host waits for the response

before sending another byte. The device responds within 20ms, unless inhibited by the host.

If the device receives an invalid byte, a byte with incorrect parity, or a framing error, it sends a

Resend ($FE) response to the host. If the next input from the host is also invalid, the device sends

an Error ($FC) response.

4.4 Power-on reset

At power-up, the mouse performs a self-test and calibration, then transmits the completion code $AA

and ID code $00. If the device fails its self-test, it transmits error code $FC and ID code $00.This

processing also occurs when a software Reset ($FF) command is received. The host should not

attempt to send commands to the device until the calibration/self-test is complete.

Power-on self-test and calibration takes 300-1000ms. Self-test and calibration following a software

Reset command takes 300-500ms.

If the host wishes to use the mouse as soon as possible after power-up and is not interested in the

$AA, $00 announcement, it can simply put the bus into the "request-to -send" state immediately on

power-up. The mouse will respond by clocking in the host's first initialization command as soon as it

is ready; this command will override the $AA, $00 announcement. If the host sends a Reset ($FF)

before the initial $AA, $00 announcement, then the $AA, $00 response to the Reset command may

be delayed by the full 300-1000ms required for power-on calibration.

7

Revision 1.0 July/16/1998

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