SM320DM355-EP Datasheet, PDF (128/156 Pages) Texas Instruments – Digital Media System-on-Chip(DMSoC)

SM320DM355-EP
Digital Media System-on-Chip (DMSoC)
SPRS575 – JULY 2009
www.ti.com
5.10 USB 2.0
The DM355 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 bytes shared by all endpoints.
– Programmable FIFO size
• 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
• USB OTG extensions, i.e. session request protocol (SRP) and host negotiation protocol (HNP)
The DM355 USB2.0 peripheral does not support the following features:
• On-chip charge pump
• High bandwidth ISO mode is not supported (triple buffering)
• 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)
5.10.1 USB2.0 Electrical Data/Timing
Table 5-25. Switching Characteristics Over Recommended Operating Conditions for USB2.0 (see
Figure 5-33)
NO.
PARAMETER
LOW SPEED
1.5 Mbps
DM355
FULL SPEED
12 Mbps
HIGH SPEED⁽¹⁾
480 Mbps
UNIT
1 t_r(D)
2 t_f(D)
3 t_frfm
4 V_CRS
5 t_jr(source)NT
t_jr(FUNC)NT
6 t_jr(source)PT
t_jr(FUNC)PT
7 t_w(EOPT)
8 t_w(EOPR)
9 t_(DRATE)
10 Z_DRV
Rise time, USB_DP and USB_DM signals⁽²⁾
Fall time, USB_DP and USB_DM signals⁽²⁾
Rise/Fall time, matching⁽³⁾
Output signal cross-over voltage⁽²⁾
Source (Host) Driver jitter, next transition
Function Driver jitter, next transition
Source (Host) Driver jitter, paired transition⁽⁴⁾
Function Driver jitter, paired transition
Pulse duration, EOP transmitter
Pulse duration, EOP receiver
Data Rate
Driver Output Resistance
MIN
75
75
80
1.3
1250
670
–
MAX
300
300
125
2
2
25
1
10
1500
1.5
–
MIN MAX
4
20
4
20
90 111.11
1.3
2
2
2
1
1
160
175
82
12
28 49.5
MIN MAX
0.5
ns
0.5
ns
%
V
ns
ns
ns
ns
ns
ns
480 Mb/s
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: C_L = 200 pF, Full Speed: C_L = 50 pF, High Speed: C_L = 50 pF
(3) t_frfm = (t_r/t_f) x 100. [Excluding the first transaction from the Idle state.]
(4) t_jr = t_px(1) - t_px(0)
USB_DM
V_CRS
USB_DP
10% V_OL
t_{per −} t_jr
90% V_OH
t_r
t_f
Figure 5-33. USB2.0 Integrated Transceiver Interface Timing
128 DM355 Peripheral Information and Electrical Specifications
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