EZZE MASS2, Техническое руководство, Страница: 56 / 137

Model MASS 2 Version V_1.0
Prepared by H/W Date 22/01/2008
Subject Technical Manual Page 34/59
Baseband Parallel Interface
The Baseband Parallel Interface features a 10-pin output bus used for timing-critical control of the external circuits. These pins
are typically used to control front-end components at the specified time along the GSM time-base, such as transmit-
enable(PA_EN), band switching(BANDSW_DCS), FEM-switch(LB_TX, HB_TX), etc.
The following table is shown the used pin for RF part.
Pin Name Pin Description Description Component
BPI_BUS 0 HB_TX Switch Module DCS/PCS TX Switch Module(LMSP54HA)
BPI_BUS 1 LB_TX Switch Module GSM TX Switch Module(LMSP54HA)
BPI_BUS 2 PCS Switch Module PCS RX Switch Module(LMSP54HA)
BPI_BUS 4 PA_EN PAM Enable PAM (RF3166)
BPI_BUS 5 BANDSW_DCS Band switch for DCS PAM (RF3166)
BPI_BUS 8 BT_LDO_EN Blue Tooth Power Supply Enable BTM(MT6601)
BPI_BUS 9 RFVCOEN RF VCO Enable Transceiver(MT6120)
Figure 36. BSI and BPI Circuit diagram.
Automatic Power Control Unit
Automatic Power Control unit is used to control the Power Amplifier module. Through APC unit, we can set the proper
transmit power level of the handset and to ensure that the burst power ramping requirements are met. In one TDMA frame, up
to 7 TDMA events can be enabled to support multi-slot transmission. In practice, 5 banks of ramp profiles are used in one
frame to make up 4 consecutive transmission slots.
The shape and magnitude of the ramp profiles are configurable to fit ramp-up, intermediate ramp, and ramp-down profiles.
Each bank of the ramp profile consists of 16 8-bit unsigned values, which is adjustable for different conditions.