LTC1407/LTC1407A
22
1407fb
* 2’ cable from counter to CLK at DUT
*No right shift is needed to right justify the input data in the main program
*
*the two msbs should also be masked
*
*******************************************************************************************
*
Loopback .set NO ;(digital looback mode?) DLB bit
Format .set BIT_16 ;(Data format? 16,12,10,8) FO bit
IntSync .set NO ;(internal Frame syncs generated?) TXM bit
IntCLK .set NO ;(internal clks generated?) MCM bit
BurstMode .set YES ;(if BurstMode=NO, then Continuous) FSM bit
CLKDIV .set 3 ;(3=default value, 1/4 CLOCKOUT)
PCM_Mode .set NO ;(Turn on PCM mode?)
FS_polarity .set YES ;(change polarity)YES=~~~\_/~~~, NO=___/~\___
CLK_polarity .set NO ;(change polarity)for BCLKR YES=_/~, NO=~\_
Frame_ignore .set !YES ;(inverted !YES -ignores frame)
XMTautobuf .set NO ;(transmit autobuffering)
RCVautobuf .set NO ;(receive autobuffering)
XMThalt .set NO ;(transmit buff halt if XMT buff is full)
RCVhalt .set NO ;(receive buff halt if RCV buff is full)
XMTbufAddr .set 0x600 ;(address of transmit buffer)
RCVbufAddr .set 0x800 ;(address of receive buffer)
XMTbufSize .set 0x200 ;(length of transmit buffer)
RCVbufSize .set 0x040 ;(length of receive buffer)
*
* See notes in the ‘C54x CPU and Peripherals Reference Guide on setting up
* valid buffer start and length values.
*
*
**********************************************************************
.eval ((Loopback >> 1)|((Format & 2)<<1)|(BurstMode <<3)|(IntCLK <<4)|(IntSync
<<5)) ,SPCval
.eval ((CLKDIV)|(FS_polarity <<5)|(CLK_polarity<<6)|((Format &
1)<<7)|(Frame_ignore<<8)|(PCM_Mode<<9)), SPCEval
.eval (SPCEval|(XMTautobuf<<10)|(XMThalt<<12)|(RCVautobuf<<13)|(RCVhalt<<15)),
SPCEval
bspi1407A:
bspc = #SPCval ; places buffered serial port in reset
bspce = #SPCEval ; programs BSPCE and ABU
axr = #XMTbufAddr ; initializes transmit buffer start address
bkx = #XMTbufSize ; initializes transmit buffer size
arr = #RCVbufAddr ; initializes receive buffer start address
bkr = #RCVbufSize ; initializes receive buffer size
bspc = #(SPCval | GO) ; bring buffered serial port out of reset
return ; for transmit and receive because GO=0xC0
APPLICATIONS INFORMATION
