NEC Network Controller uPD98502 - Manual (Page 310)

CHAPTER 6 USB CONTROLLER
310 Preliminary User’s Manual S15543EJ1V0UM
6.1.2 Internal block diagram
USB Controller internal block diagram is as shown below.
Figure 6-1. USB Controller Internal Configuration
S IE E P C
IB U S
D +
D -
U S B
B U S I/F
R x FIFO
M aster
I/F
S lav e
I/F
I/O
B uf
s lave
decoder
T x FIFO
D M A C
M C O N T
U S B C O N TR O L LE R
USB Controller's configuration features the following blocks.
SIE (Serial Interface Engine): Performs Serial/Parallel conversion, NRZI encoding/decoding, CRC calculation,
etc.
EPC (EndPoints Controller): Performs data transmission/reception for each Endpoint.
Tx FIFO (Transmit FIFO): FIFO for transmitting data
Rx FIFO (Receive FIFO): FIFO for receiving data
MCONT (Main Controller): Block for controlling transmission and reception.
DMAC (DMA Controller): Block for controlling DMA transfer.
Master_if (Master Interface): Master section of the Internal BUS interface.
Slave_if (Slave Interface): Slave section of the Internal BUS interface.
I/O Buf (I/O Buffer): I/O buffer that satisfies the electrical specifications of the USB.
Internal BUS: The internal bus of the
µPD98502.