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參數(shù)資料
| 型號(hào)： | 7641 |
| 英文描述： | 7641 Group Datasheet Datasheet 2145K/MAR.26.02 |
| 中文描述： | 7641組數(shù)據(jù)表數(shù)據(jù)表2145K/MAR.26.02 |
| 文件頁(yè)數(shù)： | 45/137頁(yè) |
| 文件大?。?/td> | 2145K |
| 代理商： | 7641 |
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44
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
USB Transmission
Endpoint 0 to Endpoint 4 have IN (transmit) FIFOs individually.
Each endpoint
’
s FIFO is configured in following way:
Endpoint 0: 16-byte
Endpoint 1: Mode 0: 512-byte
Mode 1: 1024-byte
Mode 2: 0-byte
Mode 3: 2048-byte
Mode 4: 768-byte
Mode 5: 880-byte
Endpoint 2: Mode 0: 32-byte
Mode 1: 128-byte
Endpoint 3: 16-byte
Endpoint 4: 16-byte
When Endpoint 1 or Endpoint 2 is used for data transmit, the IN
FIFO size can be selected. Endpoint 1 and Endpoint 2 have pro-
grammable IN-FIFOs size; 6 modes for Endpoint 1, and 2 modes
for Endpoint 2. Each mode can be selected by the USB endpoint
FIFO mode selection register (address 005F
16
).
When writing data to the USB Endpoint-x FIFO (addresses 0060
16
to 0064
16
) in the SFR area, the internal write pointer for the IN
FIFO is automatically increased by 1. When the AUTO_SET bit is
“
1
”
and if the stored data reaches to the max. packet value set in
USB Endpoint x IN max. packet size register (address 005B
16
),
the USB FCU sets the IN_PKT_RDY bit to
“
1
”
. When the
AUTO_SET bit is
“
0
”
, the IN_PKT_RDY bit will not be automati-
cally set to
“
1
”
; it must be set to
“
1
”
by software. (The AUTO_SET
bit function is not applicable to Endpoint 0.)
The USB FCU transmits the data when it receives the next IN to-
ken. The IN_PKT_RDY bit automatically goes to
“
0
”
when the data
transfer is complete.
G
Isochronous transfer
Endpoints 1 to 4 can be used in isochronous transfer mode. When
using isochronous transfer mode, the ISO/TOGGLE_INIT bit must
be set to
“
1
”
. When ISO_UPDATE =
“
1
”
and the corresponding
endpoint
’
s ISO/TOGGLE_INIT bit =
“
1
”
, the USB FCU delays the
rise of the IN_PKT_RDY bit until the next SOF signal transmis-
sion. In this way, the USB FCU can synchronize a transmit data to
the SOF signal.
G
Interrupt transfer mode
Endpoints 1 to 4 can be used in interrupt transfer mode. During a
regular interrupt transfer, an interrupt transaction is similar to the
bulk transfer. Therefore, there is no special setting required. When
IN-endpoint is used for a rate feedback interrupt transfer, INTPT
bit of the IN_CSR register must be set to
“
1
”
. The following steps
show how to configure the IN-endpoint for the rate feedback inter-
rupt transfer.
1. Set a value which is larger than 1/2 of the USB Endpoint-x FIFO
size to the USB Endpoint x IN max. package size register.
2. Set INTPT bit to
“
1
”
.
3. Flush the old data in the FIFO.
4. Store transmission data to the IN FIFO and set the
IN_PKT_RDY bit to
“
1
”
.
5. Repeat steps 3 and 4.
In a real application, the function-side always has transfer data
when the function sends an endpoint in a rate feedback interrupt.
Accordingly, the USB FCU never returns a NAK against the host
IN token for the rate feedback interrupt. The USB FCU always
transmits data in the FIFO in response to an IN token, regardless
of IN_PKT_RDY. However, this premises that there is always an
ACK response from Host PC after the 7641 Group has transmitted
data to IN token.
When MAXP size
≤
(a half of IN FIFO size), the IN FIFO can store
two packets (called double buffer). At this time, the IN FIFO sta-
tus can be checked by monitoring the IN_PKT_RDY bit and the
TX_NOT_EPT flag. The TX_NOT_EPT flag is a read-only flag
which shows the FIFO state. When IN_PKY_RDY = 0 and
TX_NOT_EPT = 0, IN FIFO is empty. When IN_PKY_RDY = 0 and
TX_NOT_EPT = 1, IN FIFO has one packet.
In double buffer mode, as long as the IN FIFO is not filled with
double packets, IN_PKT_RDY will not be set to
“
1
”
, even if it is set
to
“
1
”
by software, but TX_NOT_EPT flag will be set to
“
1
”
. In
single buffer mode, if MAXP > (a half of IN FIFO), this condition
never occurs.
When IN_PKT_RDY =
“
1
”
and TX_NOT_EPT =
“
1
”
, IN FIFO holds
two packets in double buffer mode and one packet in single
packet mode. In single packet mode, when the IN_PKT_RDY bit is
set to
“
1
”
by software, the TX_NOT_EPT flag is set to
“
1
”
as well.
During double buffer mode, if you want to load two packets se-
quentially, you must set the IN_PKT_RDY bit to
“
1
”
each time a
packet is loaded.
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