STV7622BMP データシートの表示（PDF） - STMicroelectronics
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STV7622BMP Datasheet PDF : 32 Pages
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Circuit description
STV7622
5.5
Differential transmission mode: RSDS (BS1 = L, BS2 = H)
In differential transmission mode, data is transmitted on two wires, one line transmits the
data value, the other the inverted data. The logic level of the data is determined by the
difference between data and inverted data. Two DB inputs are needed for the transmission
of 1 data value. The sampling clocks, CLK1 and CLK2, as well as strobes STB1/ and STB2
are also transmitted differentially. Data is sampled on the rising and falling edges of the
clock.
Table 6. 2 x 3 x 32-bit data bus transmission - differential mode
BS2 B12 DIR Input
CLK1 clock pulse number
Position 01↑ 01↓ 02↑
…
31↓ 32↑
DB1
01 04 07
DB2
DB3
HLL
OUT 02 05 08
DB4
DB5
03 06 09
DB6
DB1
190 187 184
DB2
DB3
H LH
OUT 191 188 185
DB4
DB5
192 189 186
DB6
184 187
185 188
186 189
07
04
08
05
09
06
Comment
32↓
190
191
Left /Right
shift
192
01
02
Right /Left
shift
03
In differential transmission operating mode, the biasing of the data input bus must be
carefully arranged to reduce static power consumption. In stand-by and non-active modes,
DB1, DB3, DB5, CLK1 and /STB1 should be set High to reduce bias current in the
differential input buffers.
For a High level, all differential pairs should be configured with DB1, DB3, DB5, CLK1 and
/STB1 High and with DB2, DB4, DB6, CLK2 and /STB2 Low.
When operating in differential transmission mode, a 100 ohm (1%) resistor termination must
be connected between:
q DB1 and DB2
q DB3 and DB4
q DB5 and DB6
q CLK1 and CLK2
q STB1 and STB2
with each resistor placed as close as possible to the STV7622 itself.
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