MB86606A Datasheet, PDF (10/64 Pages) Fujitsu Component Limited. – FAST-20 SCSI Protocol Controller

MB86606A
2. 16-Bit Bus Mode-MPU Interface
Pin no.
Pin name
48
CS0
47
CS1
19, 20, 22 to 24, 26 to 28 D15 to D8
17
UDP
29, 32 to 34, 36 to 39 D7 to D0
41
LDP
51, 52, 55 to 57
A4 to A0
46
RD (R/W)
44
WR (LDS)
42
BHE (UDS)
I/O
Function
I
This is used to input signals for the MPU to select the SPC
as the I/O device.
This is used to input select signals (external circuit select
I signals) for the MPU to input and output the DMA data bus
data via the SPC.
Upper byte and parity of data bus
I/O When CS0 input valid: I/O ports for internal registers in SPC
When CS1 input valid: I/O ports for DMA bus data
Lower byte and parity of data bus
I/O When CS0 input valid: I/O ports for internal registers in SPC
When CS1 input valid: I/O ports for DMA bus data
IU
These are used to input addresses for selecting the Internal
registers.
In 80-series mode: This is used to input the read strobe
signal for reading data from the SPC to
I
the MPU.
In 68-series mode: This is used to input the R/W control
signal for reading and writing data from
the MPU to the SPC.
In 80-series mode: This is used to input the write strobe
signal for writing data from the MPU to
I
the SPC.
In 68-series mode: This is used to input the LDS signal
output by the MPU when the lower byte
of the data bus is valid.
In 80-series mode: This is used to input the BHE signal
output by the MPU when the upper byte
I
of the data bus is valid.
In 68-series mode: This is used to input the UDS signal
output by the MPU when the upper byte
of the data bus is valid.
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