参数资料
型号: M7020R
厂商: 意法半导体
英文描述: 32K x 68-bit Entry NETWORK SEARCH ENGINE
中文描述: 32K的× 68位进入网络搜索引擎
文件页数: 128/150页
文件大小: 996K
代理商: M7020R
M7020R
128/150
SRAM READ with a Table of Up to Eight Devices
The following explains the SRAM READ operation
completed through a table of up to eight devices
using the following parameters: TLSZ = 01. Figure
94, page 129 diagrams a block of eight devices.
The following assumes that SRAM access is suc-
cessfully achieved through M7020R Device 0. Fig-
ure 95, page 130 and Figure 96, page 131 show
timing diagrams for Device 0 and Device 7, re-
spectively.
Cycle 1A:
The host ASIC applies the READ In-
struction on the CMD[1:0] using CMDV = 1. The
DQ Bus supplies the address, with DQ[20:19]
set to '10' to select the SRAM address. The host
ASIC selects the device for which ID[4:0] match-
es the DQ[25:21] lines. During this cycle the
host ASIC also supplies SADR[21:20] on
CMD[8:7].
Cycle 1B:
The host ASIC continues to apply the
READ Instruction on the CMD[1:0] using
CMDV = 1. The DQ Bus supplies the address
with DQ[20:19] set to '10' to select the SRAM
address.
Cycle 2:
The host ASIC floats DQ[67:0] to a 3-
state condition.
Cycle 3:
The host ASIC keeps DQ[67:0] in a 3-
state condition.
Cycle 4:
The selected device starts to drive
DQ[67:0].
Cycle 5:
The selected device continues to drive
DQ[67:0] and drives ACK from high-Z to low
Cycle 6:
The selected device drives the READ
address on SADR[21:0]. It also drives ACK
high, CE_L low, WE_L high, and ALE_L low.
Cycle 7:
The selected device drives CE_L,
ALE_L, WE_L, and the DQ Bus in a 3-state con-
dition. It continues to drive ACK low.
At the end of Cycle 7, the selected device floats
ACK in 3-state condition and a new command can
begin.
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