BMSKTOPASA900(DCE) Toshiba, BMSKTOPASA900(DCE) Datasheet - Page 628

• Manufacturer Part Number: BMSKTOPASA900(DCE)
• Description: KIT STARTER TMPA900 USB JTAG
• Manufacturer: Toshiba
• Series: TOPASr
• Type: MCUr

Specifications of BMSKTOPASA900(DCE)

• Contents: Evaluation Board, Cable(s), Software and Documentation
• For Use With/related Products: TMPA900CMXBG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UDC2-Endpoint-I/F
UDC2-OUTPUT
DEVICE packet
UDC2-OUTPUT
HOST packet
Read access
epx_dataset
int_sof
3.16.4.3 Appendix C Isochronous Transfers
1. Accessing an endpoint using Isochronous transfers
In Isochronous transfers, the isochronism of data is critical and transfers occur per frame.
Therefore, accesses to an endpoint (FIFO) using Isochronous transfers require a certain level
of performance (speed). In UDC2, the access method to each endpoint can be selected from
PVCI-I/F and Endpoint-I/F. The FIFO configuration can be selected from Single mode and
Dual mode. However, for an endpoint using Isochronous transfers, it is recommended to use
Endpoint-IF and Dual mode.
The maximum data payload size is 1024 bytes in HS mode and 1023 bytes in FS mode. To
transfer 1024 bytes using Dual mode, 2048 bytes of RAM are required. Transfers are
performed per microframe (125 µs) in HS mode and per frame (1 ms) in FS mode. In HS mode,
up to three transactions can be made in one microframe.
relevant UDC2 register. This information must also be managed by software as the Endpoint
descriptor information to be sent to the host.)
The following shows an example of endpoint access in which three transactions are made in
one microframe in HS mode. Figure 3.16.35 shows OUT transfers and Figure 3.16.36 shows IN
transfers.
(Information such as the payload size and the number of transactions must be set in the
SOF
Figure 3.16.35 Isochronous OUT transfers in HS mode (3 transactions)
OUT
1ｓｔ packet
received
Max: 1024 bytes
MDATA
TENTATIVE
TMPA900CM- 627
OUT
2nd packet
received in
empty FIFO
1st packet read
Max: 1024 bytes
MDATA
2nd packet read
It is nexessary for there to be
a space in FIFO before the
3rd packet reception.
(It is necessary for Read to
complete 1st packet)
OUT
Max: 1024 bytes
DATA2
3ｒｄ packet read
TMPA900CM
2009-10-14
SOF