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USB3250 датащи(PDF) 23 Page - SMSC Corporation

номер детали USB3250
подробное описание детали  USB2.0 PHY IC
PDF  48 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB3250 датащи(HTML) 23 Page - SMSC Corporation

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USB2.0 PHY IC
Datasheet
SMSC GT3200, SMSC USB3250
23
Revision 1.5 (03-24-06)
DATASHEET
Chapter 7 Functional Overview
Figure 2.1 Block Diagram on page 7 shows the functional block diagram of the PartNumber. Each of
the functions is described in detail below.
7.1
Modes of Operation
The PartNumber support two modes of operation. See Figure 7.1 for a block diagram of the digital
interface.
8-bit unidirectional mode. Selected when DATABUS16_8 = 0. CLKOUT runs at 60MHz. The 8-
bit transmit data bus uses the lower 8 bits of the DATA bus (ie, TXDATA[7:0] = DATA[7:0]). The
8-bit receive data bus uses the upper 8 bits of the DATA bus (ie, RXDATA[7:0] = DATA[15:8]).
16-bit bidirectional mode. Selected when DATABUS16_8 = 1. CLKOUT runs at 30MHz. An
additional signal (VALIDH) is used to identify whether the high byte of the respective 16-bit data
word is valid. The full 16-bit DATA bus is used for transmit and receive operations. If TXVALID
is asserted, then the DATA[15:0] bus accepts transmit data from the SIE. If TXVALID is deasserted,
then the DATA[15:0] bus presents received data to the SIE. VALIDH is undefined when
DATABUS16_8 = 0 (8-bit mode).



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