TMS320DM355 datasheet(127/153 Pages) TI

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5.10

USB 2.0

5.10.1 USB2.0 Electrical Data/Timing

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

DM355 includes a USB Controller Module that is built around the Mentor USB Multi-Point High-Speed

Dual Role Controller, endpoint memory, CPPI DMA controller and UTMI+ PHY. The controller conforms to

USB 2.0 Specification. The USB2.0 peripheral supports the following features:

• USB 2.0 peripheral at speeds high speed (HS: 480 Mb/s) and full speed (FS: 12 Mb/s)

• USB 2.0 host at speeds HS, FS, and low speed (LS: 1.5 Mb/s)

• All transfer modes (control, bulk, interrupt, and isochronous)

• Four Transmit (TX) and four Receive (RX) endpoints in addition to endpoint 0

• FIFO RAM

–

4K endpoint

–

Programmable FIFO size

• Connects to a standard UTMI+ PHY with a 60 MHz, 8-bit interface

• Includes a DMA sub-module that supports four TX and four RX channels of CPPI 3.0 DMAs

• RNDIS mode for accelerating RNDIS type protocols using short packet termination over USB

The USB2.0 peripheral does not support the following features:

• USB OTG extensions, i.e. session request protocol (SRP) and host negotiation protocol (HNP)

• On-chip charge pump

• High bandwidth ISO mode is not supported (triple buffering)

• 16-bit 30 MHz UTMI+ interface is not supported

• RNDIS mode acceleration for USB sizes that are not multiples of 64 bytes

• Endpoint max USB packet sizes that do not conform to the USB 2.0 spec (for FS/LS: 8, 16, 32, 64,

and 1023 are defined; for HS: 64, 128, 512, and 1024 are defined)

Table 5-25. Switching Characteristics Over Recommended Operating Conditions for USB2.0 (see

Figure 5-33)

DM355

LOW SPEED

FULL SPEED

HIGH SPEED(1)

NO.

PARAMETER

UNIT

1.5 Mbps

12 Mbps

480 Mbps

MIN

MAX

MIN

MAX

MIN

MAX

tr(D)

Rise time, USB_DP and USB_DM signals(2)

300

0.5

tf(D)

Fall time, USB_DP and USB_DM signals(2)

300

0.5

tfrfm

Rise/Fall time, matching(3)

125

111.11

VCRS

Output signal cross-over voltage(2)

1.3

tjr(source)NT

Source (Host) Driver jitter, next transition

tjr(FUNC)NT

Function Driver jitter, next transition

tjr(source)PT

Source (Host) Driver jitter, paired transition(4)

tjr(FUNC)PT

Function Driver jitter, paired transition

tw(EOPT)

Pulse duration, EOP transmitter

1250

1500

160

175

tw(EOPR)

Pulse duration, EOP receiver

670

t(DRATE)

Data Rate

1.5

480

Mb/s

ZDRV

Driver Output Resistance

–

49.5

40.5

49.5

Ω

(1)

For more detailed specification information, see the Universal Serial Bus Specification Revision 2.0, Chapter 7. Electrical.

(2)

Low Speed: CL = 200 pF, Full Speed: CL = 50 pF, High Speed: CL = 50 pF

(3)

tfrfm = (tr/tf) x 100. [Excluding the first transaction from the Idle state.]

(4)

tjr = tpx(1) - tpx(0)

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