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DP8500 bảng dữ liệu(PDF) 47 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) 47 Page - National Semiconductor (TI)

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120 Dual Accessing Functions (DP8522A) (Continued)
TLF9338 – B3
FIGURE 58b Wait States during a Port B Access
1232 LOCK Input
When the LOCK input is asserted the currently granted port
can ‘‘lock out’’ the other port through the insertion of wait
states to that port’s access cycle LOCK does not disable
refreshes it only keeps GRANTB in the same state even if
the other port requests an access as shown in
Figure 59
LOCK can be used by either port The user must guarantee
that LOCK is not asserted with Port B granted when
AVSRLRQ is asserted to request a VRAM transfer cycle
124 DUAL PORTING AND VRAM TRANSFER CYCLES
The input AVSRLRQ disables any further internally or exter-
nally requested refreshes or Port B access requests from
being executed The AVSRLRQ input does this by making
the VRAM controller arbitration logic think that a Port A ac-
cess is in progress from the point where the AVSRLRQ in-
put goes low until the VRAM shift register load operation is
completed
TLF9338 – B4
FIGURE 59 LOCK Function
47



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