Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 852

Universal Serial Bus (USB)
Signal I/O
USBRXD I Receive data. Input to the USB receiver from the differential line receiver.
USBRXP, I Gated version of D+ and D–. Used to detect single-ended zeros and the interconnect speed.
USBRXN
31.6 USB Functional Description
As shown in Figure 31-2, the USB controller consists of transmitter and receiver sections and a control
unit. The USB transmitter contains four independent FIFOs, each containing 16 bytes. There is a dedicated
FIFO for each of the four supported endpoints. The USB receiver has a single 16-byte FIFO.
31-4
Table 31-1. USB Pins Functions (continued)
RP
0
1
0
1
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Function
RN Result
0 single ended "0"
0 full speed
1 low speed
1 —
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