VSC880 查看數據表（PDF） - Vitesse Semiconductor

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VSC880

High Performance 16x16 Serial Crosspoint Switch

Vitesse Semiconductor 

Data Sheet

VSC880

VITESSE

SEMICONDUCTOR CORPORATION

High Performance 16x16

Serial Crosspoint Switch

Figure 4: Switch Configuration Interface Functional Timing (CEN=0)

REFCLK

FI[3:0]

DATA[15:0]

WEN

CCLK

F0 F1 F2 F3

C0 C1 C2 C3

Switch updated in this cycle

Min. of 5 Cycles

The switch configuration data for each port is as follows:

F0[3:0] = FI[port9], FI[port8], FI[port1], FI[port0]

F1[3:0] = FI[port11], FI[port10], FI[port3], FI[port2]

F2[3:0] = FI[port13], FI[port12], FI[port5], FI[port4]

F3[3:0] = FI[port15], FI[port14], FI[port7], FI[port6]

C0[15:0] = Port9[3:0], Port8[3:0], Port1[3:0], Port0[3:0]

C1[15:0] = Port11[3:0], Port10[3:0], Port3[3:0], Port2[3:0]

C2[15:0] = Port13[3:0], Port12[3:0], Port5[3:0], Port4[3:0]

C3[15:0] = Port15[3:0], Port14[3:0], Port7[3:0], Port6[3:0]

Where FI[portN] is the Force IDLE bit for port N and PortN[3:0] is the input port number to be connected to output

port N.

1.7 Built-in Self-Test

The switch has built-in self-test logic that can be used to verify the high-speed circuitry as well as the switch

matrix while operating at full speed. The built-in self-test mode is enabled by setting the built-in self-test enable

(BSTEN) signal HIGH. If the signal BSTLPBK is set HIGH and TESTEN is set LOW, it loops all 16 serial outputs

back to the Data Recovery Unit (DRU) at the serial inputs. An internal Pseudo Random Bit Sequence (PRBS)

generator connected to the switch matrix at port 0. The random data is sent to port 0, passed through the switch

matrix, looped back through the serial interface and returned to the data comparator. If this data matches the correct

pattern, BSTPASS is set HIGH. By configuring port 0 to connect to other ports (ports 1 through 15) through the

switch matrix using the parallel configuration interface, the rest of the serial channels (one port at a time) can be

tested in turn. For example, port 0 can be connected to port 1 by configuring the switch matrix. The PRBS generator

transmits the random data through port 0 to port 1, and the random data is then looped back from port 1 to port 0 and

the data comparator. To test all 16 ports, the user will need to configure the switch matrix 16 times to test all ports.

G52191-0, Rev 4.2

01/05/01

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