USB3500-ABZJ Standard Microsystems (SMSC), USB3500-ABZJ Datasheet - Page 21

• Manufacturer Part Number: USB3500-ABZJ
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB3500-ABZJ

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Package Type: QFN
• Rad Hardened: No
• Lead Free Status / Rohs Status: Compliant

Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface
Datasheet
Chapter 6 Detailed Functional Description
SMSC USB3500
6.1
8bit Bi-Directional Data Bus Operation
Figure 2.1 on page 9
described in detail below.
The USB3500 supports an 8-bit bi-directional parallel interface.
Figure 6.1
TXREADY is only asserted for one CLKOUT per byte time to signal the Link that the data on the DATA
lines has been read by the PHY. The Link may hold the data on the DATA lines for the duration of the
byte time. Transitions of TXVALID must meet the defined setup and hold times relative to CLKOUT.
Figure 6.2
RXACTIVE “frames” a packet, transitioning only at the beginning and end of a packet. However
transitions of RXVALID may take place any time 8 bits of data are available.
how RXVALID is only asserted for one CLKOUT cycle per byte time even though the data may be
presented for the full byte time. The XCVRSELECT signal determines whether the HS or FS timing
relationship is applied to the data and control signals.
CLKOUT runs at 60MHz
The 8-bit data bus (DATA[7:0]) is used for transmit when TXVALID = 1
The 8-bit data bus (DATA[7:0]) is used for receive when TXVALID = 0
Figure 6.1 FS CLK Relationship to Transmit Data and Control Signals
Figure 6.2 FS CLK Relationship to Receive Data and Control Signals
shows the relationship between CLKOUT and the transmit data transfer signals in FS mode.
shows the relationship between CLKOUT and the receive data control signals in FS mode.
shows the functional block diagram of the USB3500. Each of the functions is
DATASHEET
21
Figure 6.2
Revision 1.0 (06-05-08)
also shows