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Circuit Description
Table 2-1 Hardware Interface Signal Descriptions (Cont.)
SIGNAL
PIN No.
T X ATT[3:1]
3 8 , 3 9 , 4 0
BYPASS
36
GP13, GP11
6 1 , 6 3
GP[7:2]
5 , 4 , 3 , 2
1 , 1 0 0
GP[21:19]
9 1 , 9 3 , 9 4
GP[17:16]
7 6 , 7 5
N C
1 9 , 2 0 , 2 7
2 8 , 2 9 , 3 1
3 2 , 3 3 , 4 1
5 1 , 6 2 , 7 3
SYNCIN1
26
SYNCIN2
74
V C
4 8
RCVI
37
RXAMPI
18
SWGAINI
24
VREFN
4 2
A O U T
4 9
A D I N
8 7
A D O U T
35
D A I N
3 4
D A O U T
8 8
5-22
Type
Auxiliary Signals
I
Analog Transmit Attenuation.
The host can cause the modem to attenuate the transmit analog output in
steps of 2dB from 0dB by using the three encoded TXATT[3:1] inputs as
follows:
TXATT3
The TXATT[3:1] lines may be connected directly to 0V or 5V, o r t o t h re e
GPIO lines used as outputs to select the attenuation under the host
p rogram contro l .
I
Receiver Highpass Filter Bypass Enable.
The state of this pin does not have any effect on the operation of the
modem, but it should tied to either +5V or ground.
I/O
General Purpose I/O
General Purpose Input/Output
I
General Purpose Input
Unbonded Pins (These are not connected to the internal logic)
No Connection
I
Eye Sync Input 1, connect to SEPWCLK.
I
Eye Sync Input 2, connect to SEPWCLK.
Analog Interface
O
Center Voltage. 2.5V output and it needs an external capacitor.
I
Transmitter Disable. When tied to "1", it disables the transmitter side of
AFE.
I
Receiver Amplifier Input. This internally tied to pin17 which is Analog
Ground.
I
Externally connected to SWGAINI pin.
O
Negative Reference Voltage
O
Externally connected to bypass capacitor to ground.
Analog Loopback Interface
I
Analog-to-digital Data In. 1-bit input to the internal decimation filter.
O
Analog-to-digital Data Out. 1 - b i t i n p u t t o t h e i n t e r n a l AFE's RXPA TH.
I
Digital-to-analog Data In. 1 - b i t i n p u t t o t h e i n t e r n a l AFE's RXPA TH.
O
Digital-to-analog Data Out. 1-bit output from the internal digital
i n t e r p o l a t i o n f i l t e r.
Description
TXATT2
TXATT1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Attenuation (dB)
0
2
4
6
8
10
12
14
Samsung Electronics
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