IDT77V1254L25PGI IDT, Integrated Device Technology Inc, IDT77V1254L25PGI Datasheet - Page 32

• Manufacturer Part Number: IDT77V1254L25PGI
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77V1254L25PGI

• Data Rate: 25.6/51.2Mbps
• Number Of Channels: 4
• Type Of Atm Phy Interface: DPI/UTOPIA
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 144
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

periods of time (64 hours) and no bit errors were seen.
VPI/VCI Swapping
space in the header of receive cells. This function is controlled by the VPI/VCI Swap bits, which are bit 5 of the Enhanced Control Registers (0x08,
0x18, 0x28 and 0x38). The portions of the VPI/VCI that are swapped are shown below. Bits X(7:0) are swapped with Y(7:0) when the VPI/VCI Swap
bit is set and the chip is in DPI mode.
IDT77V1254L25
From the above measurements taken, the amount of jitter being added at each TX point is not significant. These tests were also run for extended
For compatibility with IDT's SwitchStar products (77V400 and 77V500), the 77V1254L25 has the ability to swap parts of the VPI/VCI address
Jitter at 51.2Mbps at point 4 with respect to point 1
Jitter at 25.6Mbps at point 4 with respect to point 1
7
GFC/VPI
VPI
VCI
HEC
VCI
PTI
VCI
VPI
CLP
0
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
32 of 48
Jitter at 25.6Mbps at point 5 with respect to point 1
X7
Y3
7
Jitter at 51.2Mbps at point 5 with respect to point 1
X6
Y2
X5
Y1
X4
Y0
X3 X2 X1
Y7 Y6 Y5
X0
Y4
0
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
December 2004