參數(shù)資料
型號: Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 26/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
26
Pinout and Signal Descriptions
21164 Signal Names and Functions
int4_valid_h<3:0>
O
4
INT4 data valid. During write operations to noncached space,
these signals are used to indicate which INT4 bytes of data are
valid. This is useful for noncached write operations that have
been merged in the write buffer.
During read operations to noncached space, these signals indi-
cate which INT8 bytes of a 32-byte block need to be read and
returned to the processor. This is useful for read operations to
noncached memory.
Note:
For both read and write operations, multiple
int4_valid_h<3:0>
bits can be set simultaneously.
When
addr_h<39>
is asserted, the
int4_valid_h<3:0>
signals
are considered the
addr_h<3:0>
bits required for byte/word
transactions. The functionality of these bits is tied to the value
stored in
addr_h<38:37>
.
Table 2 21164 Signal Descriptions
(Sheet 7 of 12)
Signal
Type Count Description
int4_valid_h<3:0>
Write Meaning
xxx1
data_h<31:0>
valid
xx1x
data_h<63:32>
valid
x1xx
data_h<95:64>
valid
1xxx
data_h<127:96>
valid
int4_valid_h<3:0>
Read Meaning
xxx1
data_h<63:0>
valid
xx1x
data_h<127:64>
valid
x1xx
data_h<191:128>
valid
1xxx
data_h<255:192>
valid
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