VSC838UG VITESSE [Vitesse Semiconductor Corporation], VSC838UG Datasheet - Page 7

• Manufacturer Part Number: VSC838UG
• Description: 3.2Gb/s 36x37 Crosspoint Switch
• Manufacturer: VITESSE [Vitesse Semiconductor Corporation]

G52351-0, Rev 3.0
02/12/01
Preliminary Data Sheet
VSC838
NOTE: The word pattern during serial read back will be four valid words followed by four ‘DON’T CARE’ words.
INCHAN1_SCLK
INCHAN1_SCLK
INCHAN0_SDIN
ALE_SCN
CONFIG
SERIAL
SERIAL
SDOUT
SDOUT
LOAD
Figure 3: Serial Mode (leave ALE_SCN pin LOW during programming)
CS
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T
sSERIAL
T
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sSERIAL
Y5
T
T
sSDIN
VITESSE
hSCAN
Y4
SEMICONDUCTOR CORPORATION
Y(n) = Output Address Bit (n); A(n) = Input Address Bit (n)
T
Y3
Read-back shift register (483 bits long) is loaded here
on rising edge of INCHAN1_SCLK with SERIAL HIGH
and ALE_SCN LOW
hSDIN
T
MSB of Program memory for
Activity Monitor Channel
Figure 4: Serial Read-Back
sSCAN
36
b5
T
Y2
dSDOUT
36
b4
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low
36
b3
Y1
36
b2
T
Y0
sCS
low
36
T
T
A5
perSCLK
perSCLK
36
b1
A4
36
b0
A3
35
b5
A2
MSB of Program memory for 36
output channel
35
b4
low
T
35
b3
sLOAD
A1
36x37 Crosspoint Switch
35
b2
A0
low
35
Y5
T
T
hLOAD
dSDOUT
T
35
b1
PWCFG
Y4
35
b0
Y3
th
T
34
b5
hCS
Y2
3.2Gb/s
Page 7