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: 48/76页
文件大小: 995K
代理商: LXT6251A
LXT6251A
21 E1 SDH Mapper
48
Datasheet
D<7:0> bus driven from active read
t
DDR
6
-
-
ns
D<7:0> access time from active read
t
ADR
-
-
17
ns
D<7:0> hold from inactive read
t
HDR
5
-
-
ns
D<7:0> HIgh impedance from inactive read
t
ZDR
t
VRD
3
-
-
16
ns
Valid read pulse width
T+2
-
-
ns
Inactive read to inactive INT (due to reset on read
feature)
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. Consecutive reads from the on-chip RAM (
expected and
transmitted
J2 strings) must be separated by more than 4*T
t
INTH
3*T + 2
-
4*T + 36
ns
Figure 19. Microprocessor Data Write Timing
Table 15. Microprocessor Data Read Timing Parameters
Parameter
Symbol
Min
Typ
Max
Unit
t
SAW
AS
MicroProcessor Write Timing (Intel Mode)
A<8:0>
WR
INT
D<7:0>
t
VL
t
SALW
t
SDW
t
HDW
t
INTH
t
HAW
t
HALW
t
SAW
AS
MicroProcessor Write Timing (Motorola Mode)
A<8:0>
E
INT
D<7:0>
t
VL
t
SALW
t
SLW
t
SDW
t
HDW
t
INTH
t
HAW
t
HALW
t
SRWB
RW
t
HRWB
t
VWR
t
VWR
t
SLW
CS
t
HCW
t
SCW
t
SCW
t
HCW
CS
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