User Guide

PAMS
Technical Documentation
RAE–2
General Information
Page 1–28
Original 02/99
PDA Module
The PDA modules has its own power management chip, the Phaser. The
Phaser regulates the voltages for PDA components. It also controls PDA pow-
er–up/down procedure by providing POWERGOOD and RESET signals to
Scotty.
The PDA processor Scotty is an embedded 486 processor manufactured by
AMD. The Scotty contains a set of PC peripherals except a parallel port. It
also has some additional peripherals like LCD controller and MMC host control-
ler which are not standard to PCs. CPU has a 8k cache.
The PDA interfaces the CMT with 115kbps serial bus (FBUS). It also provides
low frequency clock (32kHz) to CMT. PDA also can get information about CMT
state (on/off) and wake up CMT.
CMT Module
The CMT is based on DCT3 engine and it is functionally the same. Sleep clock
(32kHz) is received from PDA side.
All the audio components are controlled by CMT (COBBA). It PDA wishes to
play sounds those are first sent to CMT. Keyclicks and some system sounds
are exceptions and are played directly by PDA.