AK4679EG Datasheet, PDF (200/220 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with DSP and MIC/RCV/HP/SPK/LINE-AMP

[AK4679]
7-3. External Conditional Jump
External Conditional Jump Code Writing (during DSP Reset and RUN)
(1) COMMAND
0xF4
(2) DATA
D7~D0
External Conditional Jump code can be input during both DSP Reset and RUN. Input data is set to the designated
register on the rising edge of SYNC. The RDY pin changes to “L” when the command code is transferred, and it
changes to “H” when write operations are completed. When any single bit of “1” data in 8-bit External Jump code
matches an “1” bit data in the IFCON field, a Jump instruction is executed. Then, the RDY pin changes to “H” when
the rise of SYNC is captured. Access operation by microcontroller is prohibited until the RDY pin changes to “H”.
IFCON field is the area where the external conditions are written. This Jump code is reset to 00h by setting the IRSTN
pin to “L”, but it is not reset by DSP Reset.
7 6 5 43 21 0
External Conditional Jump Code ■ ■ ■ ■ ■ ■ ■ ■
↑
Check if “1” of IFCON field corresponds with External Condition Jump Code including Jump pins by at least
one at the same location.
7
↓
0
IFCON Field
♦ ♦♦♦ ♦♦ ♦ ♦
DSPRSTN bit
SCLK
don’tcare
SI (L/H)
F4h
D7…D0 don’tcare
(L/H)
CSN
DLRDY bit
SYNC
RDY
Next command write is available
DSPRSTN bit= “1”
SCLK
Figure 143. External Conditional Timing (in DSP Reset)
SI ^{don’tcare}
(L/H)
F4h
CSN
DLRDY bit= “0”
don’tcare
D7 … D0 _(L/H)
SYNC
RDY
max 2 x tSYNC
max0.25 x tSYNC
Figure 144. External Conditional Jump Timing (during RUN)
tSYNC= 1/fs
MS1402-E-06
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2013/02