isp1161bm NXP Semiconductors, isp1161bm Datasheet - Page 80

• Manufacturer Part Number: isp1161bm
• Description: Isp1161 Full-speed Universal Serial Bus Single-chip Host And Device Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 66:
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9397 750 09567
Product data
Endpoint
identifier
0
0
1 to 14
The total amount of FIFO storage allocated to enabled endpoints must not exceed 2462 bytes.
IN: input for the USB host (ISP1161 transmits); OUT: output from the USB host (ISP1161 receives). The data flow direction is
determined by bit EPDIR in the DcEndpointConfiguration register.
Endpoint access and programmability
11.3.1 Endpoints with programmable FIFO size
11.3.2 Endpoint access
11.3.3 Endpoint FIFO size
FIFO size
(bytes)
64 (fixed)
64 (fixed)
programmable
11.3 Endpoint descriptions
A DMA transfer is terminated when any of the following conditions are met:
When the DMA transfer is terminated, the buffer is also cleared (even if the data is not
completely read) and the DMA handler is disabled automatically. For the next DMA
transfer, the DMA controller as well as the DMA handler must be re-enabled.
Each USB device is logically composed of several independent endpoints. An
endpoint acts as a terminus of a communication flow between the host and the
device. At design time each endpoint is assigned a unique number (endpoint
identifier, see
during enumeration), the endpoint number and the transfer direction allows each
endpoint to be uniquely referenced.
The ISP1161’s DC has 16 endpoints: endpoint 0 (control IN and OUT) plus
14 configurable endpoints, which can be individually defined as interrupt, bulk,
isochronous and IN or OUT. Each enabled endpoint has an associated FIFO, which
can be accessed either via the programmed I/O interface or via DMA.
Table 66
I/O mode access. Endpoints 1 to 14 also support DMA access. DC FIFO DMA
access is selected and enabled via bits EPIDX[3:0] and DMAEN of the
DcDMAConfiguration register. A detailed description of the DC DMA operation is
given in
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 DcEndpointConfiguration register affect FIFO allocation:
•
•
•
•
[1]
DMA count is complete
Bit DMAEN = 0
DMA controller asserts EOT.
Endpoint enable bit (FIFOEN)
Section
lists the endpoint access modes and programmability. All endpoints support
Double
buffering
no
no
supported
Table
Rev. 02 — 13 December 2002
12.
66). The combination of the device address (given by the host
Full-speed USB single-chip host and device controller
I/O mode
access
yes
yes
supported
DMA mode
access
no
no
supported
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
Table 67
Endpoint
type
control OUT
control IN
programmable
ISP1161
lists the
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