Eof Setting Register (Heof) - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 14 USB Mini-HOST
14.4.8

EOF Setting Register (HEOF)

The EOF setting register (HEOF) is a register that sets a time period for which a token is
inhibited before the execution of the SOF token. If the data of the SOF timer turns out to
be lower than data in the HEOF register as a result of comparing both, and any of an IN
token, OUT token, and SETUP token execution requests is made, it will be run after the
SOF token is executed. This prevents an SOF token generated by hardware and other
tokens from being simultaneously executed. The unit of time for the HEOF register is
one-bit transfer time.
EOF Setting Register (HEOF)
Figure 14.4-8 Bit Configuration of EOF Setting Register (HEOF)
EOF setting register
Address: 0000CA
H
→
Read/Write
→
Initial value
Reset On/Off at UDCC RST bit →
Address: 0000CB
H
→
Read/Write
→
Initial value
Reset On/Off at UDCC RST bit →
[bit 15 to bit 14] Reserved
There are reserved bits. The reading is irregular. The writing does not influence the operation.
[bit 13 to bit 0] EOF1,EOF0:EOF
Set a time period during which the execution of a token is inhibited before the execution of SOF. Set a
margin that is longer than one packet length. The unit is one bit forwarding time. It is not initialized
with the RST bit in the UDC control register (UDCC). To update them, you must set the RST bit in the
UDC control register (UDCC) to "0".
For the MAXPKT=64 byte and Full Speed of set example
(Token_length + packet_length + header + CRC)×7/6 + Turn_around_time
=(34bit + 546bit)×7/6 + 36bit = 712.7bits
As the above is true, specify (2C9)
332
7 6 5
15 14 13
Reserved
(-)
(x)
(-)
.
H
4 3 2
EOF0
(R/W)
(00000000 )
B
( )
12 11 10
EOF1
(R/W)
(000000 )
B
( )
←
1 0
bit number
HEOF
←
9 8
bit number
HEOF