RSM84510 ETC, RSM84510 Datasheet - Page 6

• Manufacturer Part Number: RSM84510
• Description: PS/2 Scrolling Mouse Controller
• Manufacturer: ETC

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D). PS/2 Mouse Error Handling:
v). Data Input ( from system to RSM84510 ):
iii). The counter accumulators are cleared after receiving any command except “Resend”.
iv). RSM84510 receives a Resend command ( FE ), it transmit its last packet of data.
vi). A response is sent within 25 ms if
i). A Resend command ( FE ) following receipt of an invalid input or any input with incorrect parity.
ii). If two invalid input are received in succession, an error code of hex FC send to the system.
v). In the stream mode “Resend” is received by RSM84510 following a 3-byte data packet transmission
vii). When a command requiring a response is issued by the system ,another command should not be
beyond the rising edge of CLK. During transmission, RSM84510 check for line contention by
checking for an inactive level on CLK at intervals not to exceed 100u sec. Contention occurs when
the system lowers CLK to inhibit RSM84510 output after RSM84510 has started a transmission. If
this occurs before the rising edge of the tenth clock, RSM84510 internal store its data in its buffer
and returns DATA and CLK to an active level. If the contention does not occur by the tenth clock,
the transmission is complete.Following a transmission, the system inhibits RSM84510 by holding
CLK low until it can service the input or until the system receives a request to send a response from
RSM84510.
System first check if RSM84510 is transmitting data. If RSM84510 is transmitting, the system can
override the output forcing CLK to an inactive level prior to the tenth clock. If RSM84510
transmission is beyond the tenth clock, the system receives the data. If RSM84510 is not transmitting
or if the system choose to override the output, the system force CLK to an inactive level for a period
of not less than 100μsec while preparing for output. When the system is ready to output start bit (0),
it allows CLK go to active level. If request-to-send is detected, RSM84510 clocks 11 bits. Following
the tenth clock RSM84510 checks for an active level on the DATA line, and if found, force DATA
low , and clock once more. If occurs framing error, RSM84510 continue to clock until DATA is high,
then clocks the line control bit and request a Resend. When the system sends out a command or data
transmission that requires a response, the system waits for RSM84510 to response before sending its
next output.
to the system. RSM84510 resend the 3-byte data packet prior to clearing the counter.
a). The system requires a response
b). An error is detected in the transmission
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PS/2 SCROLLING MOUSE CONTROLLER
31/05/02
RSM84510
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