DS90CP04_07 Datasheet, PDF (15/18 Pages) National Semiconductor (TI) – 1.5 Gbps 4x4 LVDS Crosspoint Switch

Programming Example
CONFIGURATION WRITE
30 Bit Control Word: [WRITE FRAME] [ROW ADDRESS][COLUMN ADDRESS] [OUT1][OUT2][OUT3][OUT4]
ARRAY WRITE
[01 1111] [0][1] [1][1][1][1] //*Array position 1, Broadcast IN1 *//
[01 1111] [0][0] [2][2][4][4] //*Array position 0, Connect IN2 to OUT1 and 2, IN4 to OUT3 and OUT4 *//
LOAD = H and SCLK = LH
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DEVICE 0 WRITE PROGRAMMING SEQUENCE
SCLK
Number
6
18
36
48
60
Event Description
Device 0 (R=0, C=0) detects “WRITE” frame of first Control Word.
Device 0 (R=0, C=0) sees Row = 1, Column = 0 of first Control Word. The Row address of the first Control Word is
decremented by 1 (Row Address = 0) and sent out RSO.
Device 0 (R=0, C=0) detects “WRITE” frame of second Control Word.
Device 0 (R=0, C=0) sees Row = 0, Column = 0 of second Control Word. This is a valid configuration write address,
Device 1 prepares to receive configuration information.
Device 0 (R=0, C=0) has received configuration information and is waiting for a LOAD.
DEVICE 1 WRITE PROGRAMMING SEQUENCE
SCLK
Number
13
25
37
43
55
Event Description
Device 1 (R=1, C=0) detects “WRITE” frame of first Control Word.
Device 1 (R=1,C=0) sees Row = 0, Column = 0 of first Control Word. This is a valid configuration write address, Device
1 prepares to receive configuration information.
Device 1 (R=1,C=0) has received configuration information and is waiting for a LOAD.
Device 1 (R=1, C=0) detects “WRITE” frame of second Control Word.
Device 1 (R=1,C=0) sees Row = 3F, Column = 0 of second Control Word. The Row address of the second Control Word
is decremented by 1 (Row Address = 3E) and sent out RSO.
CONFIGURATION READ
30 Bit Control Word: [READ FRAME] [ROW ADDRESS][COLUMN ADDRESS] [OUT1][OUT2][OUT3][OUT4]
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