cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 355

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

CN8237
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
Figure 16-6. ZBT Flow Through SRAM Memory Timing Diagram—Two Cycle Memory
28237-DSH-001-C
RDATA or
RRNW or
RA or SA
RBW* or
RCS* or
RCLK or
SRNW
SDATA
SBW*
SCS*
SCLK
1
0 ns
t pd cs
t pd a
2
Memory Interface to ZBT SRAM Timing – read, write, read – 2 cycle memory
Table 16-6. Two Cycle Memory Timing Parameter Characteristics
t
t
t
t
t
t
t
t
NOTE(S):
(1)
(2)
s rd
h rd
pd a
pd cs
pd rnw
pd bw
en d
dis d
Symbol
3
25 ns
40 pF capacitive load
T = SCLK or RCLK period
A1
t pd rnw
t pd bw
Mindspeed Technologies
t s rd
Data setup time
Data hold time
Address propagation delay
Chip select propagation delay
Read/write propagation delay
Byte write propagation delay
Data enable
Data disable
4
Q1
t en d
50 ns
t h rd
Parameter
5
A2
D2
t dis d
6
75 ns
16.0 Electrical and Mechanical Specifications
™
7
T/2 + 1.25
T/2 + 1.25
T/2 + 1.25
T/2 + 1.25
T/2 + 1.25
T/4 + 0.25
A3
T/4 + 3
Min
0
Q3
8
100 ns
T/2 + 3.75
T/2 + 3.75
T/2 + 3.75
T/2 + 3.75
T/2 + 3.75
T/4 + 1.25
Max
—
—
9
T
10
125 ns
16.1 Timing
Units
ns
ns
ns
ns
ns
ns
ns
ns
8237_010
16-7