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DP8500 bảng dữ liệu(PDF) 46 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP8500
Giải thích chi tiết về linh kiện  DP8520A/DP8521A/DP8522A microCMOS Programmable 256k/1M/4M Video RAM Controller/Drivers
PDF  70 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP8500 bảng dữ liệu(HTML) 46 Page - National Semiconductor (TI)

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120 Dual Accessing Functions (DP8522A) (Continued)
Since the DP8522A has only one set of address inputs the
signal is used with the addition of buffers to allow the cur-
rently granted port’s addresses to reach the DP8522A The
signals which need to be bufferred are R0 – 10 C0 – 10
B0 – 1 ECAS0 – 1 and LOCK All other inputs are not com-
mon and do not have to be buffered as shown in
Figure 58a
If a Port which is not currently granted tries to access
the VRAM array the GRANTB output will transition from a
rising clock edge from AREQ or AREQB negating and will
preceed the RAS for the access by one or two clock peri-
ods GRANTB will then stay in this state until the other port
requests an access and the currently granted port is not
accessing the VRAM as shown in
Figure 58b
Dual Accessing Using the DP8522A
TLF9338 – 1
If Port B is synchronous the Request Synchronizing logic will not be required
FIGURE 58a Dual Accessing Using the DP8522A to interface a CPU and a Graphics Processor to a Video RAM System
46



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