77V550S25DTG8 IDT, Integrated Device Technology Inc, 77V550S25DTG8 Datasheet - Page 12

• Manufacturer Part Number: 77V550S25DTG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 77V550S25DTG8

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 80
• Lead Free Status / RoHS Status: Compliant

Transmit Cell Format
Transmit Cell Format
Switch Manager Commands
Switch Manager Commands
Instructions are passed on to the Switch Controller, while commands are interpreted by the Switch Manager.
except for the data field. For example, a read command cell will return with the contents of the registers of the IDT77V500 in the data field.
new command. If bit 7 of the status register is not set HIGH the Switch Manager will continue to poll until it has been set, and then do the read/write
command. Bit 6 of the Command Field is only valid for a read or write commands.
IDT77V550
This section describes the format for Switch Manager commands. In this document there is a difference between instructions and commands.
Some of the commands will return a cell to the controlling workstation. These cells will have the same values in their fields as the initiating cell
In the following commands there will be encoded two bits in the upper nibble of the command field. The table below defines the two bits (6 and 7).
By setting bit 7 of the command field, the Switch Manager will return an acknowledge cell, signalling the proper execution of a command.
When reading the Switch Manager's status register before doing a read or write, make sure that the Switch Controller is actually read to receive a
Note: 1. See “IDT77V500 Switch Controller Manager Bus Commands” table for available commands.
3
4
5
6
7
8
9-21
Byte
0
0-1
1-2
2-3
3
4
5
6
7
7
8-20
Byte
3-0
7-0
7-0
7-0
7-0
7-0
7-0
Bits
7-4
3-0; 7-4
3-0; 7-4
3-0; 7-4
3-0
7-0
7-0
7-0
7-0
7-0
7-0
Bits
PTI, CLP
HEC
Command
Switch Controller command
Cell number
Data count
Data0 - Data12
Table 11 IDT77V500 Switch Controller Manager Bus Commands (Part 2 of 2)
Field Name
GFC
VPI
VCI 15-8
VCI 7-0
PTI, CLP
HEC
Command
Sub Command
Cell number
Data count
Data0 - Data12
Field Name
Table 12 Transmit Cell Format
0x0
0x00
0x00
0x00-0xFF
0x0
0x00
0x00-0xFF
0x0-0x12
Value
0xX
0xXX
(1)
0x00-0xFF
0x0-0x12
Value
12 of 19
Set to default value 0x0
VPI address, set to 0x00
VCI address MSB, set to 0x00
VCI address, SWAD
Set to default value 0x0
Calculated by PHY device
Copy of command from received cell that initiated this cell
Sub command send to Switch Controller
A unique cell number, used in sliding window apps.
Number of bytes carried in the data payload area
Data payload area, Max 13 bytes
Ignored by Switch Manager
Ignored by Switch Manager
Command the Switch Manager to perform an action
The command written to the Switch Controller
A unique cell number, used in sliding window applications.
Number of data bytes to be in payload
Data bytes in payload, written to Switching Memory
0-7
Function
or programmed in register
Function
June 22, 2001