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Level 3 Service Manual
6881039B10
Memory Interface
The call processor IC U1100 has access, via its parallel data bus, to 1 SRAM (256k
X 16) U1400 in a 48-ball uBGA and 1 32 Mbit (2 Mbit x 16) Read-While-Write
capable burst flash EPROM U1300 in a 56-ball uBGA/FBGA (this part combines
EEPROM and Flash ROM functionality). Each of these devices is assigned specific
chip selects from the call processor IC. Within the call processor IC chip select
control register, the wait states are defined for each device. Each wait state is the
equivalent of one clock cycle; i.e., 1/16.8 MHz = 59.5 ns. The burst flash can read
sequential data at a maximum clock rate of 34.5 MHz. (29 nS). The SRAM operates
at a maximum rate of 11.76 MHz (85 nS).
Board-to-Board Interface
Interface between the controller and transceiver boards is through connectors
JBB1 and P1 (controller and transceiver board, respectively). Table 1 provides a
description of the signals on these connectors. Refer to Table 25 for detailed
connector pinouts.
Table 1. Board-to-Board Interface Signal Functions
Pin(s)
Signal Name
RX_2.75V /
1,3,5
RX_2.75V_UN
2,4,6,8,10
PAH_B+
7,11,13,15,25,26,
27,28,33,34,35,
36,39,43,47,48,
50,51,53,57,59,
Ground / RF_GND Ground.
60,61,62,67,68,
69,70,71,72,74,
75,76,79
9
REF_WARP
12,14,16,18,20
PAL_B+
17
BAND
19
MODE
21
FEIC_G1
22
PA_BIAS
23
FEIC_G2
24
RF_DETECT
29
RXQM
30
RXIM
31
RXQP
32
RXIP
37
RSSI
38
TX_2.75V
40
TX_2.75V
41
RF_SLEEP
42
TX_2.75V
44
ME_VCA
October 04, 2001
Function
2.75V supply voltage.
PA high (PCS) B+ voltage.
Analog output from AFC DAC to control the 16.8 MHz
reference oscillator.
PA low (CDMA) B+ voltage.
RF band select.
Analog/digital mode selection. Always digital.
Receive supply control.
Controls negative bias for PA.
GPIO for PA bypass (controlled by MCU or DSP).
Analog signal from transmit power diode.
Differential inputs of RX baseband analog Q-channel (-).
Differential inputs of RX baseband analog I-channel (-).
Differential inputs of RX baseband analog Q-channel (+).
Differential inputs of RX baseband analog I-channel (+).
Receive signal strength indicator.
2.75V supply voltage.
2.75V supply voltage.
Control of RF circuits in slotted sleep mode.
2.75V supply voltage.
Analog control voltage for voltage-controlled attenuator in
Mixer/Exciter IC.
Circuit Description
11
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Troubleshooting
