VSC880 查看數據表（PDF） - Vitesse Semiconductor
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VSC880 Datasheet PDF : 28 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
High Performance 16x16
Serial Crosspoint Switch
FI[15:0]Force IDLE register, bit 0 is channel 0 etc
RESY[15:0]Resynch register, bit 0 is channel 0 etc
OE[15:0]Output enable register, bit 0 is channel 0 etc
LPBK[15:0]Facility loopback register, bit 0 is channel 0 etc
Data Sheet
VSC880
1.5 Parallel CPU Interface
There is a parallel 8 bit CPU interface on the VSC880 that can be used to read and write the status and control
registers described above. This is an asynchronous interface that was design to operate with many common micro
controllers that are available. The functional timing diagrams for a write and a read are shown in the following
figures. Timing information can be found in the AC Characteristics section of this data sheet.
CWEN
CSEL
ADDR
CDATA
Figure 2: CPU Interface Functional Write Cycle Timing
Valid Address
Valid Data
CWEN
CSEL
ADDR
CDATA
Figure 3: CPU Interface Functional Read Cycle Timing
Valid Address
Valid Data Hi-Z
1.6 Parallel Configuration Interface
In addition to reading and writing the switch configuration using the CPU interface as described above, the entire
switch matrix can be reprogrammed in 4 word clocks by setting the CEN signal LOW. If CEN is set LOW, the
parallel interface DATA[15:0] contains a 16 bit switch configuration input port, the inputs FI[3:0] load the FI bits and
the WEN signal becomes a programming signal as shown in the figure below. It takes 4 word clocks to load all 64 bits
of switch configuration data and 16 FI bits into holding registers. All data transfer timing is relative to REFCLK.
After data has been loaded, and if CCLK is HIGH, all 80 bits of data are strobed into the switch matrix and FI control
logic. Otherwise, the configuration information is stored in holding registers until the next CCLK pulse strobes it in.
Since the CCLK signal is delayed internally in the switch, it can be asserted as early as the WEN signal pulse to
strobe in the configuration information.
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© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52191-0, Rev 4.2
01/05/01
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