华辰机器:dsp 高手请进

一段TMS320C的程序，有高手给讲解一下：
******PAGE 6 MEMORY ALLOCATION *********
CPHI3 EQU 0 ** COS(PHIn+3) **
CPHIM3 EQU 13 ** SIN(PHIn+3) **

PUW EQU 15
CSAVE EQU 16 ** SAVE FOR COS(PHIn+3)
SSAVE EQU 17 ** SAVE FOR SIN(PHIn+3)
MOD1 EQU 18 ** INPUT BIT TO THE I-CHANNEL OF THE MODULATOR
UWDLIN EQU 19
ELCTR EQU 20
TEMP6 EQU 21
TGAIN EQU 22
T34 EQU 23
TF9 EQU 24 FOR INITIAL. 32044,FOR Q0256 DEC. INPUT
DECIN EQU 24 FOR INITIAL. 32044,FOR Q0256 DEC. INPUT
T33 EQU 25 FOR INITIAL. 32044,
T6466 EQU 26
T32 EQU 27 FOR INITIAL. 32044,
T1224 EQU 28
T31 EQU 29 FOR INITIAL. 32044,
OEDLY EQU 29
FLAG EQU 30
N8 EQU 31
UWDYL EQU 32
SR16 EQU 33
SR9 EQU 40
PA EQU 41
********* PAGE 6 FOR MODU. AND DEMODU. STARTING TIME **
SETMOD EQU 42
SETDEM EQU 43
********* PAGE 6 FOR PN SEQUENCE GENERATION *****
AFCFLG EQU 44
TABLPT EQU 45
A EQU 46
SSR1 EQU 47
SSR15 EQU 49