ISL59532_0708 Datasheet, PDF (19/24 Pages) Intersil Corporation – 32x32 Video Crosspoint

Serial Timing Diagram
SLATCH
ISL59532
SLATCH falling edge timing/placement is a “don’t care.”
Serial data is latched only on rising edge of SLATCH.
T
t_SL
SCLK
SDI
t_HD
t_SD
B0
B1
B2
(LSB)
t_w
B15
(MSB)
SDO
B0
B1
B2
(previous) (previous) (previous)
B15
B0
B1
B2
(previous) (LSB)
SDO = SDI delayed by 15.5 SCLKs to allow daisy-chaining of multiple ISL59532s. SDO changes on the falling edge of SCLK.
PARAMETER
T
t_W
t_SD
t_HD
t_SL
TABLE 1. SERIAL TIMING PARAMETERS
RECOMMENDED OPERATING RANGE
DESCRIPTION
≥200ns
SCLK period
0.50 * T
Clock Pulse Width
≥20ns
Data Setup Time
≥20ns
Data Hold Time
≥20ns
Final SLCK rising edge (latching B15) to SLATCH rising edge
Programming Model
The ISL59532 is configured by a series of 16-bit serial control words. The three MSBs (B15-13) of each serial word determine the
basic command:
TABLE 2. COMMAND FORMAT
B15 B14 B13
COMMAND
NUMBER OF WRITES
0
0
0 INPUT/OUTPUT: Maps input channels to output channels
32 (1 channel per write)
0
0
1 OUTPUT ENABLE: Output enable for individual channels
4 (8 channels per write)
0
1
0 GAIN SET: Gain (x1 or x2) for each channel
4 (8 channels per write)
0
1
1 BROADCAST: Enables broadcast mode and selects the input channel to be
1
broadcast to all output channels
1
1
1 CONTROL: Clamp on/off, operational/standby mode, and global output
1
enable/disable
Mapping Inputs to Outputs
Inputs are mapped to their desired outputs using the input/output control word. Its format is:
TABLE 3. INPUT/OUTPUT WORD
B15 B14 B13 B12 B11 B10 B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
0
0
I₄
I₃
I₂
I₁
I₀
-
-
-
O₄
O₃
O₂
O₁
O₀
I₄:I₀ form the 5 bit word indicating the input channel (0 to 31), and O₄:O₀ determine the output channel which that input channel will
map to. One input can be mapped to one or multiple outputs. To fully program the ISL59532, 32 INPUT/OUTPUT words must be
transmitted - one for each input channel.
Note: Broadcast Mode must be disabled when configuring input/output mapping. INPUT/OUTPUT words transmitted while in
Broadcast Mode will not be processed correctly and result in corrupt channel mapping when Broadcast Mode is disabled.
19
FN7432.6
August 29, 2007