LOUIS View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'LOUIS' PDF : 18 Pages View PDF
ST5481
If Pin CFG1 is 1, when reset (PON,USB,PIN) is active the initial state is INACTIVE.
Figure 7 : S Interface States - CFG1=1
STT(5)=1
M1 OFF
OFFS LINE ACTIVATION
NOT POSSIBLE
STT(5)=0
STT(5)=1
PON RESET /
USB REQUEST/
PIN RESET
M2
ACTIVE
PUP or NLSD=0
PDN or PDWN=1
M3
INACTIVE S LINE ACTIVATION
POSSIBLE
9 - ENDPOINTS CONFIGURATION AND DEDICATION
These endpoints are organized as one interface
(interface 0), one configuration (configuration 1).
The interface being composed of four alternate
settings. Hereafter in the document RX data
direction is from S line to PC and is considered as
IN by USB protocol.
The endpoints are:
– 4 isochronous endpoints for B1 and B2 channels
(fifo 32 bytes in each direction)
• EP3 input endpoint for B1 channel IN(RX) on S
line
- associated to IN(RX) fifo 32 bytes
• EP2 output endpoint for B1 channel OUT(TX)
on S line
- associated to OUT(TX) fifo 32 bytes
• EP5 input endpoint for B2 channel IN(RX) on S
line
- associated to IN(RX) fifo 32 bytes
• EP4 output endpoint for B2 channel OUT(TX)
on S line
- associated to OUT(TX) fifo 32 bytes
– 2 isochronous endpoints for D channels (fifo 16
bytes in each direction)
• EP7 input endpoint for D channel IN(RX) on S
line
- associated to IN(RX) fifo 16 bytes
• EP6 output endpoint for D channel OUT(TX) on
S line
- associated to OUT(TX) fifo 16 bytes
– 1 control endpoint means management of USB
standards, Communication Device Class (CDC)
standards (unused), and vendor requests (S in-
terface application dedicated):
• EP0
- internal configuration and control registers
- D, B1, B2 channels transmit commands
- CI primitives to be transmitted
– 1 interrupt endpoint used for vendor interrupts
• EP1
- channels reception or transmission indications
- CI primitives in receive direction
- D, B1, B2 channel reception indications
- S line status
- GPIO input changes
The alternate settings are:
• Alternate setting 0: EP0, EP1.
- initialisation configuration
• Alternate setting 1: EP0, EP1, EP2, EP3, P6, EP7
- connection 64Kbits through B1 channel
• Alternate setting 2: EP0, EP1, EP4, EP5, EP6, EP7
- connection 64Kbits through B2 channel
• Alternate setting 3: EP0, EP1, EP2, EP3, EP4,
EP5, EP6, EP7
- connection 128Kbps (144Kbits/sec) through
B1 + B2 + (data into D) channels
10/18
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