參數(shù)資料
型號(hào): TMS34020
廠商: Texas Instruments, Inc.
英文描述: GRAPHICS PROCESSORS
中文描述: 圖形處理器
文件頁(yè)數(shù): 45/82頁(yè)
文件大?。?/td> 1359K
代理商: TMS34020
TMS34020, TMS34020A
GRAPHICS PROCESSORS
SPVS004D – MARCH 1990 – REVISED NOVEMBER 1993
45
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
Q4
Q1
Q2
Q3
Q4*
Q1
Q2
Q3
Q4
Q1
Row
Column
Prevoius Read
Valid
I/O Data
Local-Memory Host Read I/O Cycle
HA/HBS
HCS
HREAD
HWRITE
HRDY
HOE
HDST
LAD
GI
CAMD
RCA
SF
ALTCH
RAS
CAS
WE
TR/QE
DDIN
DDOUT
LRDY
SIZE16
PGMD
BUSERR
R0
R1
DATA
(out)
*See clock stretch, page 21.
Figure 22. Host Read Cycle From TMS34020 I/O Registers
The host read of the TMS34020 I/O registers suppresses the generation of TR/QE and CAS so that data is read
from the TMS34020 rather than from memory. DDOUT is enabled so that data CAN flow through external buffers
on the LAD bus to the host data latches. The TMS34020 I/O registers may be accessed in any of the host access
modes (random/same, block, or read/modify/write).
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