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DS31256 bảng dữ liệu(PDF) 155 Page - Maxim Integrated Products

tên linh kiện DS31256
Giải thích chi tiết về linh kiện  256-Channel, High-Throughput HDLC Controller
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DS31256 bảng dữ liệu(HTML) 155 Page - Maxim Integrated Products

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DS31256 256-Channel, High-Throughput HDLC Controller
155 of 183
11.3 Examples of Bus Timing for Local Bus PCI Bridge Mode Operation
Figure 11-5. 8-Bit Read Cycle
Intel Mode (LIM = 0)
Arbitration Enabled (LARBE = 1)
Bus Transaction Time = 4 LCLK (LRDY = 0100)
An attempted access by the host causes the local bus to request the bus. If bus access has not been granted
(
LBGACK deasserted), the timing shown at the top of the page applies, with LHOLD being asserted. Once
LHLDA is detected, the local bus grabs the bus for 32 to 1,048,576 clocks and then releases it. If the bus has
already been granted (
LBGACK asserted), the timing shown at the bottom of the page applies.
LCLK
LHOLD
LHLDA
LBGACK
32 to 1,048,576 LCLKs
LA[19:0]
LD[7:0]
LD[15:8]
LRD
LWR
Address Valid
LBHE
Tri-state
Tri-State
Tri-State
Tri-State
LCLK
12
3
4
Note: LA, LD,
LBHE, LWR, and LRD are tri-stated.



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