TMS320DM641 Datasheet, PDF (125/171 Pages) Texas Instruments – Video/Imaging Fixed-Point Digital Signal Processors

Multichannel Audio Serial Port (McASP0) Peripheral
Table 4−32. McASP0 Data Registers
HEX ADDRESS RANGE ACRONYM
REGISTER NAME
3C00 0000 − 3C0F FFFF
RBUF/XBUFx
McASPx receive buffers or McASPx transmit buffers via
the Peripheral Data Bus.
COMMENTS
(Used when RSEL or XSEL
bits = 0 [these bits are located
in the RFMT or XFMT
registers, respectively].)
4.9.3 McASP0 Electrical Data/Timing
4.9.3.1 Multichannel Audio Serial Port (McASP) Timing
Table 4−33. Timing Requirements for McASP (see Figure 4−33 and Figure 4−34)
NO.
1 tc(AHCKRX)
2 tw(AHCKRX)
3 tc(CKRX)
4 tw(CKRX)
Cycle time, AHCLKR/X
Pulse duration, AHCLKR/X high or low
Cycle time, ACLKR/X
Pulse duration, ACLKR/X high or low
5 tsu(FRXC-KRX) Setup time, AFSR/X input valid before ACLKR/X latches data
6 th(CKRX-FRX) Hold time, AFSR/X input valid after ACLKR/X latches data
7 tsu(AXR-CKRX) Setup time, AXR input valid before ACLKR/X latches data
8 th(CKRX-AXR) Hold time, AXR input valid after ACLKR/X latches data
ACLKR/X ext
ACLKR/X ext
ACLKR/X int
ACLKR/X ext
ACLKR/X int
ACLKR/X ext
ACLKR/X int
ACLKR/X ext
ACLKR/X int
ACLKR/X ext
−400
−500
−600
MIN MAX
20
10
33
16.5
5
5
5
5
5
5
5
5
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Table 4−34. Switching Characteristics Over Recommended Operating Conditions for McASP
(see Figure 4−33 and Figure 4−34)
NO.
PARAMETER
9 tc(AHCKRX)
10 tw(AHCKRX)
11 tc(CKRX)
12 tw(CKRX)
13 td(CKRX-FRX)
Cycle time, AHCLKR/X
Pulse duration, AHCLKR/X high or low
Cycle time, ACLKR/X
Pulse duration, ACLKR/X high or low
Delay time, ACLKR/X transmit edge to AFSX/R output valid
14 td(CKX-AXRV)
Delay time, ACLKX transmit edge to AXR output valid
Disable time, AXR high impedance following last data bit from
15 tdis(CKRX−AXRHZ) _{ACLKR/X transmit edge}
ACLKR/X int
ACLKR/X int
ACLKR/X int
ACLKR/X ext
ACLKX int
ACLKX ext
ACLKR/X int
ACLKR/X ext
−400
−500
−600
MIN MAX
20
10
33
16.5
−1
5
0
10
−1
5
0
10
0
10
0
10
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
June 2003 − Revised August 2004
SPRS222C ¹²⁵