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DP8420A bảng dữ liệu(PDF) 39 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP8420A
Giải thích chi tiết về linh kiện  microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
PDF  58 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
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DP8420A bảng dữ liệu(HTML) 39 Page - National Semiconductor (TI)

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100 Dual Accessing (DP8422A) (Continued)
Since the DP8422A 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 DP8422A The
signals which need to be bufferred are R0 – 10 C0 – 10
B0 – 1 ECAS0–3 WE and LOCK All other inputs are not
common and do not have to be buffered as shown in
Figure
34a If a Port which is not currently granted tries to access
the DRAM array the GRANTB output will transition from a
rising clock edge from AREQ or AREQB negating and will
precede 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 DRAM as shown in
Figure 34b
TLF8588 – 55
If Port B is synchronous the Request Synchronizing logic will not be required
FIGURE 34a Dual Accessing with the DP8422A (System Block Diagram)
39



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