Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 863

0 1
Field CRC5
Reset
R/W
Addr
Table 31-5 describes FRAME_N fields.
Bits Name
0–4 CRC5 CRC5 calculated on frame number
5–11 FRAME The frame number is inserted by the application software.
NUMBER
The frame number field is also updated by the USB controller when the
USB is configured as a host, to indicate that the SOF was transmitted.
Therefore the FRAME_N field should always be regenerated and rewritten
to the entry before SOF is issued.
31.10.2 USB Function Code Registers (RFCR and TFCR)
RFCR and TFCR control the value that the user wants to appear on the address type pins (AT1–AT3) when
the associated SDMA channel accesses memory, as well as the required byte ordering for the data buffer.
Figure 31-11 shows the USB function code registers.
Field
Figure 31-11. USB Function Code Registers (RFCR and TFCR)
Freescale Semiconductor
4 5
0000_0000_0000_0000
USB base + 0x10
Figure 31-10. Frame Number (FRAME_N) in HOST mode
Table 31-6. FRAME_N in Host Mode Field Descriptions
0 1 2
—
MPC885 PowerQUICC Family Reference Manual, Rev. 2
FRAME NUMBER
R/W
Description
NOTE
3 4 5
BO
Universal Serial Bus (USB)
15
6 7
AT
31-15