isp1181 NXP Semiconductors, isp1181 Datasheet - Page 12

• Manufacturer Part Number: isp1181
• Description: Isp1181 Full-speed Universal Serial Bus Interface Device
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 4:
[1]
[2]
9397 750 08938
Product data
Endpoint
identifier
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
The total amount of FIFO storage allocated to enabled endpoints must not exceed 2462 bytes.
IN: input for the USB host (ISP1181 transmits); OUT: output from the USB host (ISP1181 receives). The data flow direction is
determined by bit EPDIR in the Endpoint Configuration Register.
Endpoint access and programmability
FIFO size (bytes)
64 (fixed)
64 (fixed)
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
9.2 Endpoint FIFO size
The size of the FIFO determines the maximum packet size that the hardware can
support for a given endpoint. Only enabled endpoints are allocated space in the
shared FIFO storage, disabled endpoints have zero bytes.
programmable FIFO sizes.
The following bits in the Endpoint Configuration Register (ECR) affect FIFO
allocation:
Remark: Register changes that affect the allocation of the shared FIFO storage
among endpoints must not be made while valid data is present in any FIFO of the
enabled endpoints. Such changes will render all FIFO contents undefined.
•
•
•
Endpoint enable bit (FIFOEN)
Size bits of an enabled endpoint (FFOSZ[3:0])
Isochronous bit of an enabled endpoint (FFOISO).
[1]
Double
buffering
no
no
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
Rev. 04 — 30 October 2001
I/O mode
access
yes
yes
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
DMA mode
access
no
no
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
supported
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
Full-speed USB interface
Table 5
Endpoint type
control OUT
control IN
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
programmable
lists the
ISP1181
[2]
[2]
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