AK7750 Datasheet, PDF (33/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
b) Master Mode: SMODE = “H”
Master mode requires a clock input to XTI.
When a clock is applied to the XTI input, LRCLK (LRCLK_O) and BITCLK (BITCLK_O) are automatically
generated by an XTI-synchronized internal counter.
No output is available on LRCLK (LRCLK_O) and BITCLK (BITCLK_O) pins during an initial reset
( INIT_RESET = “L” ) or a system reset ( INIT_RESET = “H” and S_RESET = “L” ).
• EESEL = “L”
LRCLK_O(1fs ) and BITCLK_O( 64fs ) are output.
When LRCLK_I and BITCLK_I pins are not connected to any external circuit, these pins should be tied
low ( “L” level, (DVSS)).
When the AK7750 is used in Analog-to-Analog fashion and when LRCLK_O and BITCLK_O are not
required (SDIN and SDOUT pins are not used), BITCLK_O and LRCLK_O can be programmed by
setting a control register.
• EESEL = “H”
LRCLK ( 1fs ) and BITCLK ( 64fs ) are output.
When the AK7750 is used in Analog-to-Analog fashion and when LRCLK and BITCLK are not required
(SDIN and SDOUT pins are not used), BITCLK_O and LRCLK_O can be programmed by setting a
control register.
c) SMODE Pin Switching
Setting the SMODE pin function after power-on should be performed either during an initial reset
( INIT_RESET = “L” and S_RESET = “L”), or during a clock reset ( CK_RESET = “L” and S_RESET
= “L” ).
Since switching between Slave and Master modes is controlled by the SMODE pin, an erroneous
operation may occur if pin set changes take place under any conditions other than those described
above.
In Slave mode operation, internal clock phase-synchronization is performed at the release of system
reset (from S_RESET = “L” to “H” ). It should be noted that switching to Slave mode in the middle of an
operation may cause an erroneous results.
d) Corresponding Table of SMODE, CKSX and EESEL pins
CKSX
“H”
“H”
“H”
“H”
“L”
“L”
“L”
“L”
SMODE
“L”
“H”
“L”
“H”
“L”
“L”
“H”
“H”
EESEL
“L”
“L”
“H”
“H”
“L”
“H”
“L”
“H”
selected CLK
XTI
XTI
XTI
XTI
BITCLK_I
BITCLK
N/A
N/A
note
not available
not available
[MS0296-E-00]
33
2005/03