Section 18 Universal Serial Bus Interface (USB)
Rev. 3.00 Jan 25, 2006 page 557 of 872
REJ09B0286-0300
•
USB port control register (UPRTCR)
•
USB test register 0 (UTESTR0)
•
USB test register 1 (UTESTR1)
18.3.1
USB Data FIFO
FIFOs combined with EPDRs intervene in data transfer between this LSI (slave CPU) and the
USB function core. The USB function core performs data transmission to or from the USB host
(host).
This LSI incorporates 80 bytes of specific FIFOs, and a RAM-FIFO unit (RFU) that can be used
as a maximum of 4096 bytes of FIFOs by using on-chip RAM.
As shown in table 18.2, specific FIFOs can be used in two ways based on whether EP2 is used or
not. In EP0I, EP0O, EP1, and EP2, the maximum packed size of the data packet is specified as
half of the FIFO size (bytes). In EP0S and EP3, the maximum packet size of the data packet is
equal to the FIFO size (bytes). EP0S is a specific FIFO for setup command reception, which is
enabled or disabled by the SETICNT bit in USBMDCR. For details on RAM-FIFOs that form
EP4 and EP5, refer to section 8, RAM-FIFO Unit (RFU).
In the host input transfer, all data items sent from the slave are written to a specific FIFO before
the slave transmission is initiated. In the host output transfer, the host transfer is completed before
the slave reads all data items from the specific FIFO.
Table 18.2 FIFO Configuration
Endpoint
Transfer Direction
FIFO Size
Configuration
Description
EP0S
OUT (SETUP)
8 bytes
8 bytes × 1
EP0O
OUT
16 bytes
8 bytes × 2
Endpoint 0
EP0I
IN
16 bytes
8 bytes × 2
Endpoint 1
EP1
IN
16 bytes
8 bytes × 2
32 bytes
16 bytes × 2
Endpoint 2
EP2
IN/OUT
16 bytes
8 bytes × 2
0 bytes
Not used
Endpoint 3
EP3
IN
8 bytes
8 bytes × 1
Specific FIFO
Endpoint 4
EP4
IN
Max. 2048 bytes
Max. 64 bytes
× 32
Endpoint 5
EP5
OUT
Max. 2048 bytes
Max. 64 bytes
× 32
RAM-FIFO
(RFU)
Содержание H8S/2158
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