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參數(shù)資料
| 型號： | MAX9273GTL/V+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 25/49頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SERIALIZER 22BIT GMSL 40TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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MAX9273
22-Bit GMSL Serializer with Coax or
STP Cable Drive
31
Maxim Integrated
Control-Channel Broadcast Mode
The serializer supports broadcast commands to control
multiple peripheral devices. Select an unused device
address to use as a broadcast device address. Program
the remote-side GMSL device to translate the broadcast
device address (source address stored in registers 0x09,
0x0B) to the peripheral device address (destination
address stored in register 0x0A, 0x0C). Any commands
sent to the broadcast address are sent to all designated
peripherals, while commands sent to a peripheral’s unique
device address are sent to that particular device only.
GPO/GPI Control
GPO on the serializer follows GPI transitions on the dese-
rializer. This GPO/GPI function can be used to transmit
signals such as frame sync in a surround-view camera
system. The GPI-to-GPO delay is 0.35ms (max). Keep
time between GPI transitions to a minimum 0.35ms. This
includes transitions from the other deserializer in the
coax-mode splitter. Bit D4 of register 0x0E in the deserial-
izer stores the GPI input state. GPO is low after power-up.
The FC can set GPO by writing to the SET_GPO register
bit. Do not send a logic-low value on the serializer RX/
SDA input (UART mode) longer than 100Fs in either base
or bypass mode to ensure proper GPO/GPI functionality.
Pre/Deemphasis Driver
The serial line driver employs current-mode logic (CML)
signaling. The driver is differential when programmed
for twisted-pair cable. When programmed for coax, one
side of the CML driver is used. The line driver has pro-
grammable pre/deemphasis that modifies the output to
compensate for cable length. There are 13 preemphasis
settings, as shown in Table 5. Negative preemphasis
levels are deemphasis levels where the preemphasized
swing level is the same as normal swing, but the no-
transition data (e.g., a 1 followed by a 1) is deempha-
sized. Program the preemphasis levels through register
0x06 D[3:0] of the serializer. This preemphasis function
compensates the high-frequency loss of the cable and
enables reliable transmission over longer link distances.
Current drive for both TP and coax modes is program-
mable. CMLLVL bits (0x06, D[7:4]) program drive current
in TP and coax modes for single-ended voltage swings
from 100mV to 500mV.
Spread Spectrum
To reduce the EMI generated by the transitions on the
serial link, the serializer output is programmable for
spread spectrum. If the deserializer driven by the serial-
izer has programmable spread spectrum, do not enable
spread for both at the same time or their interaction
Table 5. TP/Coax Drive Current (CMLLVL = 1000)
*Negative preemphasis levels denote deemphasis.
PREEMPHASIS
LEVEL (dB)*
PREEMP SETTING
(0x06, D[3:0])
ICML
(mA)
IPRE (mA)
SINGLE-ENDED VOLTAGE SWING
MAx (mV)
MIN (mV)
-6.0
0100
12
4
400
200
-4.1
0011
13
3
400
250
-2.5
0010
14
2
400
300
-1.2
0001
15
1
400
350
0
(power-on default)
0000
16
0
400
1.1
1000
16
1
425
375
2.2
1001
16
2
450
350
3.3
1010
16
3
475
325
4.4
1011
16
4
500
300
6.0
1100
15
5
500
250
8.0
1101
14
6
500
200
10.5
1110
13
7
500
150
14.0
1111
12
8
500
100
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