Texas Instruments Dual/Single Socket CardBus and UntraMedia Controller PCI7621 - Manual (Page 259)

12−5
12.5 Class Code and Revision ID Register
The class code and revision ID register categorizes the base class, subclass, and programming interface of the
function. The base class is 08h, identifying the controller as a generic system peripheral. The subclass is 05h,
identifying the function as an SD host controller. The programming interface is 01h, indicating that the function is a
standard SD host with DMA capabilities. Furthermore, the TI chip revision is indicated in the least significant byte
(00h). See Table 12−4 for a complete description of the register contents.
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Name Class code and revision ID
Type R R R R R R R R R R R R R R R R
Default 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name Class code and revision ID
Type R R R R R R R R R R R R R R R R
Default 0 0 0 0 0 0 0 X X X X X X X X X
Register: Class code and revision ID
Offset: 08h
Type: Read-only
Default: 0805 0XXXh
Table 12−4. Class Code and Revision ID Register Description
BIT FIELD NAME TYPE DESCRIPTION
31−24 BASECLASS R Base class. This field returns 08h when read, which broadly classifies the function as a generic system
peripheral.
23−16 SUBCLASS R Subclass. This field returns 05h when read, which specifically classifies the function as an SD host
controller.
15−8 PGMIF R Programming interface. If bit 0 (DMA_EN) in the general control register is 0, then this field returns 00h
when read to indicate that the function is a standard SD host without DMA capabilities. If the DMA_EN
bit is 1, then this field returns 01h when read to indicate that the function is a standard SD host with
DMA capabilities.
7−0 CHIPREV R Silicon revision. This field returns the silicon revision of the SD host controller.