Nec Network Controller uPD98502 Manual do Utilizador Página 310

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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
SIE EPC
IBUS
D+
D-
USB
BUS I/F
Rx FIFO
Master
I/F
Slave
I/F
I/O
Buf
slave
decoder
Tx FIFO
DMAC
MCONT
USB CONTROLLER
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
µ
PD98502.
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