參數(shù)資料
型號(hào)： SMJ34020AGB
廠商： Texas Instruments, Inc.
英文描述： GRAPHICS SYSTEM PROCESSOR
中文描述： 圖形系統(tǒng)處理器
文件頁(yè)數(shù)： 22/92頁(yè)
文件大小： 1458K
代理商： SMJ34020AGB
SMJ34020A
GRAPHICS SYSTEMPROCESSOR
SGUS011B – APRIL 1991 – REVISED AUGUST 1995
22
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
enabling clock stretch (continued)
The following are examples of stretch-mode memory operations.
two 32-bit nonpage-mode reads
READ
ADDR
READ
ADDR
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
READ
ADDR
READ
ADDR
4
3
2
1
4
4
3
1
4
3
2
4
4
3
2
1
1
2
Stretch
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
one 32-bit page-mode read-modify-write
WRITE
READ
ADDR
4
3
2
1
4
3
2
1
4
3
2
1
WRITE
READ
ADDR
4
3
2
4
4
3
2
4
4
3
2
1
1
1
Stretch
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
three 32-bit page-mode reads
READ
READ
READ
ADDR
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
READ
READ
READ
ADDR
4
3
2
1
4
3
1
4
3
2
4
4
3
2
1
1
2
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
The stretched cycles are designed to accommodate worst-case 32-bit page-mode accesses, so during some
nonpage-mode memory accesses stretches that are not essential can be generated. For example:
one 32-bit nonpage-mode read-write
WRITE
ADDR
READ
ADDR
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
WRITE
ADDR
READ
ADDR
4
3
2
1
4
4
3
4
4
3
2
4
4
3
2
1
1
2
Stretch
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
1
Stretch
Stretches are inserted in read-modify-write accesses to help ease bus turn-around timings. In the above
example, the second stretch is not needed to help these timings because the read/write turn-around has the
whole of the address cycle to evaluate.
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