- 您现在的位置：买卖IC网 > PDF目录98083 > SM34020AHTM32 (TEXAS INSTRUMENTS INC) GRAPHICS PROCESSOR, CQFP132 PDF资料下载
参数资料
| 型号： | SM34020AHTM32 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 图形处理器 |
| 英文描述： | GRAPHICS PROCESSOR, CQFP132 |
| 封装： | CERAMIC, QFP-132 |
| 文件页数： | 16/98页 |
| 文件大小： | 1546K |
| 代理商： | SM34020AHTM32 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页
SMJ34020A
GRAPHICS SYSTEM PROCESSOR
SGUS011D -- APRIL 1991 -- REVISED SEPTEMBER 2004
23
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251--1443
enabling clock stretch (continued)
When stretch mode is enabled, the following machine cycles are stretched:
D
All address cycles of all memory-access sequences
D
Read data cycles in read-modify-write sequences
Notes:
a) The host default cycle shown in the TMS34020 User’s Guide is not stretched because it is not a true
address cycle; that is, RAS, etc., do not go low.
b) The CPU default cycle, which is similar to the host default cycle in that RAS, etc., do not go low, is
also not stretched.
c) Clock-stretch mode disregards the page-mode input so that read data cycles in nonpage-mode
read-modify-write sequences are stretched even though there are no timing constraints that require
astretch.
d) All other memory subcycles are not stretched, even if the SMJ34020A is running with the CSE bit
set to 1.
The advantage of this implementation of clock-stretch mode is that the SMJ34020A can execute code at
maximum speed, slowing down only during certain parts of memory access sequences.
It is important to remember that a stretched cycle is 25% longer than a normal cycle and that the SMJ34020A
(with the exception of the video logic, which is clocked independently by VCLK) effectively slows down during
such a stretched cycle.
Figure 5 through Figure 8 show examples of stretch-mode memory operations.
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
3
1
4
3
2
4
3
2
11
2
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
Figure 5. Two 32-Bit Nonpage-Mode Reads
WRITE
READ
ADDR
4
3
2
1
4
3
2
1
4
3
2
1
WRITE
READ
ADDR
4
3
2
4
3
2
4
3
2
11
1
Stretch
Stretch Mode Enabled
Stretch Mode Disabled
Figure 6. One 32-Bit Page-Mode Read-Modify-Write
相关PDF资料 |
PDF描述 |
|---|---|
| SM563 | 4-BIT, MROM, MICROCONTROLLER, PQFP64 |
| SM565 | 4-BIT, MROM, MICROCONTROLLER, PQFP100 |
| SM5K7 | 4-BIT, MROM, MICROCONTROLLER |
| SM5L3 | 4-BIT, MROM, MICROCONTROLLER, PQFP80 |
| SM802104UMG | 212.5 MHz, OTHER CLOCK GENERATOR, QCC24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SM34020AHTM40 | 制造商:TI 制造商全称:Texas Instruments 功能描述:GRAPHICS SYSTEM PROCESSOR |
| SM34020APCM40 | 制造商:Texas Instruments 功能描述:Graphics System Processor 144-Pin PQFP 制造商:Texas Instruments 功能描述:GRAPHICS SYS PROCESSOR 144PQFP - Trays |
| SM34020GMB30 | 制造商:Texas Instruments 功能描述: |
| SM34061A WAF | 制造商:Texas Instruments 功能描述: |
| SM34061GB | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Non-VGA Video Controller |
发布紧急采购，3分钟左右您将得到回复。