Specification
NET2270 USB Interface Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 3.6, April 17, 2003
62
8.6.4 (Address 08h; EP_TRANSFER0) Transfer Count Register (Byte 0)
Bits
Description
Read
Write
Default
Value
7:0
EP_TRANSFER[7:0]. For IN endpoints, this field determines the total number of
bytes to be sent to the host. This field should be written before any packet data is
written to the buffer. When the count reaches zero, any remaining data in the buffer
is validated. Writing a zero to this register when EP_TRANSFER1 and
EP_TRANSFER2 have a value of 0 validates the buffer. Note that validation takes
about 100 nsec.
For OUT endpoints, this counter is cleared when the NAK OUT packets bit is
cleared (EP_RSPCLR bit 7). This counter is incremented for every byte read from
the packet buffer. If 16-bit mode is selected and only one of the two bytes is valid,
the counter will only increment by 1.
Yes
Yes
0
8.6.5 (Address 09h; EP_TRANSFER1) Transfer Count Register (Byte 1)
Bits
Description
Read
Write
Default
Value
7:0
EP_TRANSFER[15:8].
Yes
Yes
0
8.6.6 (Address 0Ah; EP_TRANSFER2) Transfer Count Register (Byte 2)
Bits
Description
Read
Write
Default
Value
7:0
EP_TRANSFER[23:16].
Yes
Yes
0
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