22

LTC1407/LTC1407A

1407f

APPLICATIO S I FOR ATIO

* 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