ISP1581
Hi-Speed USB peripheral controller
Philips Semiconductors
9.3.6 Endpoint Type register (address: 08H)
This register sets the Endpoint type of the indexed endpoint: isochronous, bulk or
interrupt. It also serves to enable the endpoint and configure it for double buffering.
Automatic generation of an empty packet for a zero length TX buffer can be disabled
via bit NOEMPKT. The register contains 2 bytes and the bit allocation is shown in
Table 24.
Table 24: Endpoint Type register: bit allocation
Bit
15
14
13
12
11
10
9
8
Symbol
Reset
reserved
R/W
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Bus reset
Access
Bit
7
6
5
4
3
2
1
0
ENDPTYP[1:0]
00H
Symbol
Reset
reserved
NOEMPKT
ENABLE
DBLBUF
-
-
-
-
-
-
0
0
0
0
0
0
Bus reset
Access
00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 25: Endpoint Type register: bit description
Bit
Symbol
Description
15 to 5 reserved
reserved.
4
3
NOEMPKT
ENABLE
No Empty Packet: A logic 0 causes an empty packet to be
appended to the next IN token of the USB data, if the Buffer
Length register or the Endpoint MaxPacketSize register is zero.
A logic 1 disables this function. This bit is applicable only in
DMA mode.
Endpoint Enable: A logic 1 enables the FIFO of the indexed
endpoint. The memory size is allocated as specified in the
Endpoint MaxPacketSize register. A logic 0 disables the FIFO.
Note: ‘Stalling’ a data endpoint will confuse the Data Toggle bit
on the stalled endpoint because the internal logic picks up from
where it has stalled. Therefore, the Data Toggle bit must be
reset by disabling and re-enabling the corresponding endpoint
(by setting the bit ‘ENABLE’ to 0 or 1 in the endpoint type
register) to reset the PID.
2
DBLBUF
Double Buffering: A logic 1 enables double buffering for the
indexed endpoint. A logic 0 disables double buffering.
1 to 0
ENDPTYP[1:0]
Endpoint Type: These bits select the endpoint type as follows:
01H — isochronous
02H — bulk
03H — interrupt.
9.3.7 Short Packet register (address: 24H)
This register is reserved.
9397 750 13462
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data
Rev. 06 — 23 December 2004
27 of 79
NXP [ NXP ]
