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): 38/82頁
文件大?。?/td> 1359K
代理商: TMS34020
TMS34020, TMS34020A
GRAPHICS PROCESSORS
SPVS004D – MARCH 1990 – REVISED NOVEMBER 1993
38
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
Q4
Q1
Q2
Q3
Q4*
Q1
Q2
Q3
Q4
Q1
Row
Address
Tap Point
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 15. Memory-to-Split-Serial-Data-Register Cycle (VRAM Split-Register Read Transfer)
This VRAM cycle is performed when a video timeout due to a match of the MLRNXT register occurs, the VCE
bit in DPYCTL is cleared, and the SSV bit in DPYCTL is set. This cycle is indicated by TR/QE low and CAS, SF,
and WE high at the time RAS goes low. The timing of the low-to-high transition of TR/QE is not dependent upon
the timing of SCLK because there is not as great a timing constraint to position the cycle as in midline reload.
During the address portion of the cycle, the status on LAD0–LAD3 indicates a video-initiated VRAM
memory-to-register transfer (status code = 0100). Although PGMD and SIZE16 are ignored on this cycle, they
should be held at valid levels as shown.
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