HFC-SP Cologne Chip AG, HFC-SP Datasheet - Page 60
![no-image](/images/no-image-200.jpg)
HFC-SP
Manufacturer Part Number
HFC-SP
Description
Isdn S/t HDLC Basic Rate Controller
Manufacturer
Cologne Chip AG
Datasheet
1.HFC-SP.pdf
(83 pages)
- Current page: 60 of 83
- Download datasheet (2Mb)
863C@
6.2
Timing diagram 2: SRAM access
& _V (#
SYMBOL
t
t
SYMBOL
f
t
t
t
t
t
BUSRDH
CYCLE
CLK
LOW
HIGH
SRA
SRAH
CLK
f
*
For write accesses to the HFC-SP the data lines must be stable and valid before /IOW or /DS get
low. With Intel compatible processors it may be neccessary to delay the /IOW or /DS signals.
CLK
**)
**)
important!
/ f
SRAM access
CLK
Delay Time from /IOR High to BUSDIR High
Read/Write cycle
OSC_IN frequency
Relative OSC_IN frequency deviation
OSC_IN Cycle Time
OSC_IN Low Level Width
OSC_IN High Level Width
Address Stable after OSC_IN
Address Stable Hold Time after OSC_IN
CHARACTERISTICS
CHARACTERISTICS
12.288MHz
t
t
1/ f
MIN.
CLK
CLK
2ns
1ns
0
CLK
/ 3
/ 3
6 x t
MIN.
2ns
CLK
24.576MHz
:Q^eQbi " !
Cologne
Chip
MAX.
15ns
10
–
MAX.
15ns
-4
–
*)
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