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DP8420V bảng dữ liệu(PDF) 39 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP8420V
Giải thích chi tiết về linh kiện  microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
PDF  60 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP8420V bảng dữ liệu(HTML) 39 Page - National Semiconductor (TI)

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100 Dual Accessing (DP8422V DP84T22) (Continued)
Since the DP8422V DP84T22 has only one set of address
inputs the signal is used with the addition of buffers to
allow the currently granted port’s addresses to reach the
DP8422V DP84T22 The signals which need to be buf-
ferred 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 periods 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
TLF11109 – 59
If Port B is synchronous the Request Synchronizing logic will not be required
FIGURE 34a Dual Accessing with the DP8422V DP84T22 (System Block Diagram)
39



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