参数资料
型号: LXT6251A
英文描述: ATM/SONET MAPPER|CMOS|QFP|208PIN|PLASTIC
中文描述: 的ATM / SONET的映射器|的CMOS | QFP封装| 208PIN |塑料
文件页数: 49/76页
文件大小: 995K
代理商: LXT6251A
21 E1 SDH Mapper
LXT6251A
Datasheet
49
Table 16. Microprocessor Data Write Timing Parameters
Parameter
Symbol
Min
Typ
Max
Unit
A<8:0> setup time to active write
t
SAW
t
HAW
1
t
SALW
2
t
HALW
2
t
VL
2
t
SLW
2
8
-
-
ns
A<8:0> hold time from inactive write
3
-
-
ns
A<8:0> setup time to latch
1
-
-
ns
A<8:0> hold time from latch
3
-
-
ns
Valid latch pulse width
1.5
-
-
ns
AS rising edge to active write setup
10
-
-
ns
RW setup to active write
t
SRWB
3
-
-
ns
RW hold from inactive write
t
HRWB
2
-
-
ns
CS setup to active write
t
SCW
2
-
-
ns
CS hold from inactive write
t
HCW
2
-
-
ns
D<7:0> setup to inactive write
t
SDW
9
-
-
ns
D<7:0> hold from inactive write
t
HDW
t
VWR
3
6
-
-
ns
Valid write pulse width
T+2
-
-
ns
Inactive write to inactive INT (due to interrupt masking)
t
INTH
12
-
36
ns
1. For non multiplexed Address and Data bus (AS tied high)
2. For multiplexed Address and Data bus (AS used as address latch enable)
3. T is the minimum cycle time of either MTBYCK or DTBYCK (typically 51.44 ns for STM1, 154.32 ns for STM0)
4. There must be more than 4*T between the rising edge of a write to a BIP or REI error counter and the falling edge of the read
to a BIP or REI error counter
5. Consecutive writes to the on-chip RAM (
expected and
transmitted
J2 strings) must be separated by more than 4*T
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