IDT77V400S156DS IDT, Integrated Device Technology Inc, IDT77V400S156DS Datasheet - Page 22

• Manufacturer Part Number: IDT77V400S156DS
• Description: IC SW MEMORY 8X8 1.2BGPS 208PQFP
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77V400S156DS

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 77V400S156DS

Cell Alignment Options
Cell Alignment Options
Cell Alignment Options
Cell Alignment Options
Memory Refresh Requirements
Memory Refresh Requirements
Memory Refresh Requirements
Memory Refresh Requirements
maximum refresh interval; that is, the REFRESH command (see "Control Interface Command" Table) must be executed at least 2048 times during
each interval. Refresh rate numbers are calculated using a 36MHz SCLK. Refresh is only required for systems which utilize extended cell storage due
to queuing requirements above 155Mbps.
IDT77V400
The Buffer Memory of the IDT77V400 must be refreshed by the Control Logic periodically to guarantee data retention. This table defines the
No Pre/Post Pend Data
1 byte prepended
1 byte postpended
2 bytes prepended
1 byte prepended and 1 byte postpended
2 bytes postpended
3 bytes prepended
2 bytes prepended and 1 byte postpended
1 byte prepended and 2 bytes prepended
3 bytes postpended
4 bytes prepended
3 bytes prepended and 1 byte postpended
2 bytes prepended and 2 bytes postpended
1 byte prepended and 3 bytes postpended
4 bytes postpended
1.
Byte locations are decimal values.
Commercial
Industrial
1.
This information is provided for applications using the IDT77V500 Switch Controller.
Cell Configuration
Grade
32ms
16ms
Maximum Refresh
Interval
Start
SAM
Without HEC
4
3
4
2
3
4
1
2
3
4
0
1
2
3
4
9
9
INIT Command Value
22 of 26
SAM
Stop
(Decimal)
77V500
55
55
55
55
55
0
0
1
0
0
1
1
2
2
3
Byte Location in Cell
1
Start
SAM
—
—
—
—
—
4
3
4
2
3
4
1
2
3
4
1FF
1FF
INIT Command Value
SAM Stop
With HEC
no-skip
77V500
—
—
—
—
—
0
0
1
0
1
2
0
1
2
3
1
(Hex)
1
SAM Stop
skip
—
—
—
—
—
—
1
1
2
1
2
3
1
2
3
March 31, 2001