80960HA Datasheet, PDF (14/102 Pages) Intel Corporation – 80960HA/HD/HT 32-Bit High-Performance Superscalar Processor

80960HA/HD/HT
Table 7. 80960Hx Processor Family Pin Descriptions (Sheet 1 of 4)
Name
Type
Description
A31:2
D31:0
DP3:0
PCHK
BE3:0
W/R
D/C
O
H(Z)
B(Z)
R(Z)
I/O
S(L)
H(Z)
B(Z)
R(Z)
I/O
S(L)
H(Z)
B(Z)
R(Z)
O
H(Q)
B(Q)
R(1)
O
H(Z)
B(Z)
R(1)
O
H(Z)
B(Z)
R(0)
O
H(Z)
B(Z)
R(0)
ADDRESS BUS carries the upper 30 bits of the physical address. A31 is the most
significant address bit and A2 is the least significant. During a bus access, A31:2
identify all external addresses to word (4-byte) boundaries. The byte enable
signals indicate the selected byte in each word. During burst accesses, A3 and A2
increment to indicate successive addresses.
DATA BUS carries 32, 16, or 8-bit data quantities depending on bus width
configuration. The least significant bit of the data is carried on D0 and the most
significant on D31. The lower 8 data lines (D7:0) are used when the bus is
configured for 8-bit data. When configured for 16-bit data, D15:0 are used.
DATA PARITY carries parity information for the data bus. Each parity bit is
assigned a group of 8 data bus pins as follows:
DP3 generates/checks parity for D31:24
DP2 generates/checks parity for D23:16
DP1 generates/checks parity for D15:8
DP0 generates/checks parity for D7:0
Parity information is generated for a processor write cycle and is checked for a
processor read cycle. Parity checking and polarity are programmable. Parity
generation/checking is only performed for the size of the data accessed.
PARITY CHECK indicates the result of a parity check operation. An asserted
PCHK indicates that the previous bus read access resulted in a parity check error.
BYTE ENABLES select which of the four bytes addressed by A31:2 are active
during a bus access. Byte enable encoding is dependent on the bus width of the
memory region accessed:
32-bit bus:
BE3 enables D31:24
BE2 enables D23:16
BE1 enables D15:8
BE0 enables D7:0
16-bit bus:
BE3 becomes Byte High Enable (enables D15:8)
BE2 is not used (state is undefined)
BE1 becomes Address Bit 1 (A1)
BE0 becomes Byte Low Enable (enables D7:0)
8-bit bus:
BE3 is not used (state is undefined)
BE2 is not used (state is undefined)
BE1 Address Bit 1 (A1)
BE0 Address Bit 0 (A0)
WRITE/READ is low for read accesses and high for write accesses. W/R
becomes valid during the address phase of a bus cycle and remains valid until the
end of the cycle for non-pipelined accesses. For pipelined accesses, W/R
changes state when the next address is presented.
0= Read
1= Write
DATA/CODE indicates that a bus access is a data access or an instruction
access. D/C has the same timing as W/R.
0 = Code
1 = Data
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