參數(shù)資料
型號(hào): T7121-EL2
英文描述: T7121 HDLC Interface for ISDN
中文描述: T7121的HDLC接口用于ISDN
文件頁(yè)數(shù): 51/68頁(yè)
文件大?。?/td> 685K
代理商: T7121-EL2
Lucent Technologies Inc.
51
Data Sheet
April 1997
T7121 HDLC Interface for ISDN (HIFI-64)
Timing Characteristics
(continued)
Multiplexed Address and Data
Both address and data on AD7—AD0.
* This is the time needed to update the receive FIFO status RQS (R4—B[6—0]).
See Figure 24 for data clock period specification.
Table 26. Multiplexed Address and Data
Symbol on
Diagram
A
B
C
D
E
F
G
H
I
J
Name
Parameter
Min
Max
Unit
tALHALL
tADVALL
tADHALL
tALLRWL
tCSLRWL
tDVWRH
tWRHDI
tWRLWRH
tRDLRDH
tRDLDV
ALE Pulse Width
Address Valid to ALE Low
Address Hold After ALE Low
ALE Low to
RD
or
WR
Low
CS
Low to
RD
or
WR
Low
Data Valid to
WR
High
Data Hold After
WR
High
WR
Pulse Width
RD
Pulse Width
RD
Low to Data Valid (R2 or R4)
RD
Low to Data Valid (all others)
RD
High to Data 3-state
WR
High to
CS
High
RD
High to
CS
High
WR
High to
WR
Low (minimum time
between writes)
RD
High to
RD
Low (minimum time
between reads); Read R3 to Read R4*
Master Clock Period
25
25
0
35
0
35
10
40
3 tMCLMCL
tMCLMCL + 40
tMCLMCL
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tMCLMCL + 40
K
L
M
N
tRDHDI
tWRHCSH
tRDHCSH
tWRHWRL
0
10
ns
ns
ns
ns
2 tMCLMCL
O
tRDHRDL
4 tMCLMCL
ns
P
tMCLMCL
83.3
<tDCLDCL
ns
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