參數(shù)資料
型號: M38K27M4L-XXXFP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 71/151頁
文件大?。?/td> 1403K
代理商: M38K27M4L-XXXFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 26 of 147
REJ03B0193-0300
USB Function Control Circuit (USBFCC)
Block Diagram
The following diagram shows the USBFCC block diagram. The cir-
cuit comprises:
(1) Serial Interface Engine (SIE)
(2) Device Control Unit (DCU)
(3) Internal Memory Interface (MIF)
(4) CPU Interface (CIF)
Fig. 24 USB Function Control Circuit (USBFCC) block diagram
CPU
CIF
USB Function Control Circuit
DCU
MIF
SIE
DCU control
DCU status
MIF control
SIE control
SIE status
Transmit/Receive
data
USB
Transceiver
D0+
D0-
Multi-Channel RAM
(1) Serial Interface Engine (SIE)
The SIE performs the following USB lower-layer protocols (pack-
ets, transactions):
Sampling of receive data and clock, generation of transmit clock
Serial-to-parallel conversion of transmit/receive data
NRZI (Non Return Zero Invert) encode/decode
Bit stuffing/unstuffing
SYNC (Synchronization Pattern) detection, EOP (End of
Packet) detection
USB address detection, endpoint detection
CRC (Cyclic Redundancy Check) generation and checking
(2) Device Control Unit (DCU)
The DCU manages the following USB upper-layer protocols (ad-
dress/endpoint and control-transfer sequence):
Status control for each endpoint
Control-transfer sequence control
Memory interface status control
(3) Memory Interface (MIF)
The MIF controls the flow of data transfer between the SIE and the
multi-channel RAM under the management of the DCU.
(4) CPU Interface (CIF)
The CIF performs the following functions:
Mode setting via registers, DCU control signal generation, DCU
status signal reading
Interrupt signal generation
Internal bus interface control.
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