TCC76 Datasheet, PDF (131/259 Pages) List of Unclassifed Manufacturers – 32-bit RISC Microprocessor For Digital Media Player

TCC76x
Specification Rev. 0.07
32-bit RISC Microprocessor for Digital Media Player
February 23, 2005
USB CONTROLLER
Indicates that the packet has been successfully sent to
host.
0
R
An interrupt is generated when the this bit is cleared, so
the CPU can load the next packet.
For a zero length data phase, the CPU must set IRDY and
DEND at the same time.
ORDY [0]
1
Type
R
OUT Packet Ready
Indicates that a valid token is written to the FIFO. An
interrupt is generated after this flag is set.
The CPU can clear this by writing a 1 to CLOR bit.
IN CSR1 Register (INCSR1n)
0x80000544
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
CTGL STST ISST FLFF UNDER FNE IRDY
This register maintains the status bits for IN type endpoints in EP1 or EP2.
CTGL [6] Type
Clear Data Toggle Bit
1
W The data toggle bit is cleared
STST [5]
1
0
Type
R
W
STALL Handshake Issued to an IN token
Indicates that the STALL handshake is issued to an IN
token, due to the CPU setting ISST bit. When the USB
issues a STALL handshake, IRDY flag is cleared.
Clear STST flag by writing 0.
ISST [4]
1
0
Type
R/W
Issue STALL Handshake
Issue a STALL Handshake to the USB.
End the STALL condition.
FLFF [3]
1
0
Type
W
R
Issue FIFO Flush
IN FIFO is flushed. This bit is cleared by the USB when
the FIFO is flushed. The interrupt is generated when this
happens. If a token is in progress, the USB waits until the
transmission is complete before the FIFO is flushed. If
two packets are loaded into the FIFO, only the top-most
packet (one that was intended to be sent to the host) is
flushed, and the corresponding IRDY bit for that packet
is cleared.
The USB clears this bit after flushing FIFO.
UNDER
[2]
1
Type
Under Run
R/W Valid for Iso mode only. This bit is set when an IN token
is received and the IRDY bit is not set. A zero length
data packet is sent and the next packet that is loaded into
the FIFO is flushed. This bit is cleared by writing 0.
Preliminary
9-9