參數(shù)資料
型號: TMS34020
廠商: Texas Instruments, Inc.
英文描述: GRAPHICS PROCESSORS
中文描述: 圖形處理器
文件頁數(shù): 36/82頁
文件大?。?/td> 1359K
代理商: TMS34020
TMS34020, TMS34020A
GRAPHICS PROCESSORS
SPVS004D – MARCH 1990 – REVISED NOVEMBER 1993
36
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
Q4
Q1
Q2
Q3
Q4*
Q1
Q2
Q3
Q4
Q1
Row
Address
Data Out 1
Q2
Q3
Q4
Q1
Data Out 2
1st Column
2nd Column
GI
LAD
CAMD
RCA
ALTCH
RAS
CAS
WE
TR/QE
SF
DDIN
DDOUT
LRDY
PGMD
SIZE16
BUSFLT
R0
R1
*See clock stretch, page 21.
Figure 13. Write Cycle Using Mask
This special 1M VRAM control cycle is performed when the PMASKL and PMASKH registers are set to nonzero,
the CST bit in DPYCTL is cleared, the VEN bit in CONFIG is set, and the byte-aligned pixel-write instruction is
executed. This cycle is indicated by CAS, TR/QE, and SF high and WE low at the falling edge of RAS, and by
SF low at the falling edge of CAS. The data on LAD is written to memory just as a normal DRAM write, except
that data in the write mask is used to enable the DQ bits that are written to memory. During the address portion
of the cycle, the status on LAD0–LAD3
indicates that a pixel operation is being performed (status code = 1101).
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