Specifications

A–14 System Address Space 9 March 1999 – Subject To Change
21164 Byte/Word PCI Space
Table A–3 shows noncached 21164 addresses when byte/word support is enabled.
A.4.1 21164 Size Field
Table A–4 shows the calculation of the 21164 size field.
The following transactions use single data transfers on the PCI:
• INT1 and INT2 read and write transactions
• INT4 read transactions
The following transactions have multiple data transfers on the PCI:
• INT4 write transactions
• INT8 read and write transactions
Table A–3 21164 Byte/Word Addressing
Instruction
addr_h
<38:37>
int4_valid
<3> <2> <1> <0>
LDQ 00 INT8 —— —
LDL 01 addr_h<3:2> —Undefined—
LDWU 10 addr_h<3:1> —— Undefined
LDBU 11 addr_h<3:0> —— —
STQ 00 INT4 Mask — — —
STL 01 INT4 Mask — — —
STW 10 addr_h<3:1> —— Undefined
STB 11 addr_h<3:0> —— —
Table A–4 21164 Byte/Word Translation Values
Size<38:37> Data Size
00 INT8 (Quadword — 8 bytes, 64 bits)
01 INT4 (Longword — 4 bytes, 32 bits)
10 INT2 (Word — 2 bytes, 16 bits)
11 INT1 (Byte — 1 byte, 8 bits)