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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
102
Notes:† “Fixed” indicates whether the function/pin is defined by the microcontroller pinout (fixed)
or is implementation-specific (not fixed).
8.6.2.3 P2
P2 is the high-order address and data bus for external device access. It is not used for general I/
O purposes.
8.6.2.4 P3
P3 provides four dedicated-function signals, and four implementation-specific control signals, as
shown in Table 8-5: P3 Functions.
Table 8-4: P1 Functions
Bit Name I/O Fixed† Function
7 SDA I/O Y
I
2
C serial data signal for the IPMB.
6 SCL I/O Y
I
2
C serial clock signal for the IPMB.
5 Reserved - N Reserved for future use.
4 SCSI _reset_L O N Reset SCSI controller. If 0, places the 53C80S SCSI chip into
reset. If 1, the SCSI interface chip comes out of reset and oper-
ates normally.
3 SCSI_DRQ I N SCSI DMA Request. Connected to the DRQ signal of the
53C80S SCSI chip. Allows the microcontroller to use the DMA
transfer capabilities of the SCSI interface chip, which results in
higher performance.
2 Reserved - N Reserved for future use.
1 SDA_Local I/O N
Serial data for private I
2
C connection to temperature sensor.
0 SCL_Local O N
Serial clock for private I
2
C connection to temperature sensor.
Table 8-5: P3 Functions
Bit Name I/O Fixed† Function
7 RD_L O Y Read strobe. Indication from the microcontroller that the current
bus cycle is a read operation.