Intel PXA27 Series Design Manual page 263

D.13 AC '97
The AC '97 controllers in the PXA27x processor and PXA25x processor are similar with the
exception of these features:
•
An optional output AC97_SYSCLK (approximately 24.5 MHz) clock signal is available on
the PXA27x processor.
•
Clean shutdown functionality has been added with receive trailing bytes being handled
differently in the PXA27x processor.
•
The following registers have been changed:
— Register GCR now utilizes bit 24 and some bit names have changed.
— Register GSR has a new bit 3 and some bit names have changed.
— Registers POCR, PICR, MCCR, MOCR, and MICR have new bit 1.
— Registers POSR, PISR, MCSR, MOSR, and MISR have bit 4 functionality changes and
bit 2 is new.
2
D.14 I S (Inter IC Sound Controller)
2
The I S controllers in the PXA27x processor and PXA25x processor are similar with the exception
of these features:
•
Features added to the PXA27x processor I
— Clean startup functionality has been added.
— Clean shutdown functionality has been added.
— Serial audio clocks and sampling frequencies have changed slightly.
— Register SASR0 has a new bit.
D.15 MultiMediaCard/SD/SDIO Controller
The MMC/SD/SDIO Card controllers in the PXA27x processor and PXA25x processor are similar
with the exception of these features.
Features added to the PXA27x processor MMC/SD/SDIO card controller:
•
Secure Digital (SD) and Secure Digital I/O communication protocols support available for
PXA27x processor.
•
One and three byte data transfers are supported for PXA27x processor.
•
Three signals (MMDAT1, MMDAT2, and MMDAT3) have been added for 4-bit SD Card and
SDIO Card protocol data support; the PXA25x processor only had one data signal.
•
Registers MMC_STRPCL and MMC_STAT have new bits and functionality of other bits have
changed from the PXA25x processor implementation.
•
Registers MMC_RDWAIT and MMC_BLKS_REM have been added to the PXA27x
processor.
•
Register MMC_CMDAT has an additional bit.
®
Intel PXA27x Processor Family Design Guide
®
Intel PXA27x Processor and Intel
®
PXA25x Processor Differences
2
S controller:
D-9