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ISP1181A Datasheet PDF : 70 Pages
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Philips Semiconductors
ISP1181A
Full-speed USB peripheral controller
8. Modes of operation
The ISP1181A has four bus configuration modes, selected via pins BUS_CONF1 and
BUS_CONF0:
Mode 0
Mode 1
Mode 2
Mode 3
16-bit I/O port shared with 16-bit DMA port
reserved
8-bit I/O port shared with 8-bit DMA port
reserved.
The bus configurations for each of these modes are given in Table 3. Typical interface
circuits for each mode are given in Section 21.1.
Table 3:
Mode
0
1
2
3
Bus configuration modes
BUS_CONF[1:0] PIO width
0
0 D[15:1], AD0
0
1 reserved
1
0 D[7:1], AD0
1
1 reserved
DMA width
DMAWD = 0 DMAWD = 1
-
D[15:1], AD0
reserved
D[7:1], AD0
reserved
-
reserved
reserved
Description
multiplexed address/data on pin AD0;
bus is shared by 16-bit I/O port and
16-bit DMA port
reserved
multiplexed address/data on pin AD0;
bus is shared by 8-bit I/O port and 8-bit
DMA port
reserved
9. Endpoint descriptions
Each USB peripheral is logically composed of several independent endpoints. An
endpoint acts as a terminus of a communication flow between the host and the
peripheral. At design time each endpoint is assigned a unique number (endpoint
identifier, see Table 4). The combination of the peripheral address (given by the host
during enumeration), the endpoint number, and the transfer direction allows each
endpoint to be uniquely referenced.
The ISP1181A has 16 endpoints: endpoint 0 (control IN and OUT) plus 14
configurable endpoints, which can be individually defined as
interrupt/bulk/isochronous, IN or OUT. Each enabled endpoint has an associated
FIFO, which can be accessed either via the parallel I/O interface or via DMA.
9.1 Endpoint access
Table 4 lists the endpoint access modes and programmability. All endpoints support
I/O mode access. Endpoints 1 to 14 also support DMA access. FIFO DMA access is
selected and enabled via bits EPIDX[3:0] and DMAEN of the DMA Configuration
Register. A detailed description of the DMA operation is given in Section 10.
9397 750 13959
Product data
Rev. 05 — 08 December 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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