SL811HS
USB-A/USB-B Host Base Length [Address = 02h, 0Ah].
Table 5. USB-A / USB-B Host Base Length Definition [Address 02h, 0Ah]
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
HBL7
HBL6
HBL5
HBL4
HBL3
HBL2
HBL1
HBL0
The USB A/B Host Base Length register contains the maximum packet size transferred between the SL811HS and a slave USB
peripheral. Essentially, this designates the largest packet size that is transferred by the SL811HS. Base Length designates the size
of data packet sent or received. For example, in full speed BULK mode, the maximum packet length is 64 bytes. In ISO mode, the
maximum packet length is 1023 bytes since the SL811HS only has an 8-bit length; the maximum packet size for the ISO mode using
the SL811HS is 255 – 16 bytes (register space). When the Host Base length register is set to zero, a Zero-Length packet is transmitted.
USB-A/USB-B USB Packet Status (Read) and Host PID, Device Endpoint (Write) [Address = 03h, 0Bh]. This register has two
modes dependent on whether it is read or written. When read, this register provides packet status and contains information relative
to the last packet that has been received or transmitted. This register is not valid for reading until after the Done interrupt occurs, which
causes the register to update.
Table 6. USB-A/USB-B USB Packet Status Register Definition when READ [Address 03h, 0Bh]
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
STALL
NAK
Overflow
Setup
Sequence
Time-out
Error
ACK
Bit Position Bit Name
Function
7
6
5
STALL
NAK
Slave device returned a STALL.
Slave device returned a NAK.
Overflow
Overflow condition - maximum length exceeded during receives. For underflow, see
USB-A/USB-B Host Transfer Count Register (Read), USB Address (Write) [Address = 04h,
0Ch].
4
3
2
Setup
This bit is not applicable for Host operation since a SETUP packet is generated by the host.
Sequence bit. ’0’ if DATA0, ’1’ if DATA1.
Sequence
Time-out
Timeout occurred. A timeout is defined as 18-bit times without a device response (in full
speed).
1
0
Error
ACK
Error detected in transmission. This includes CRC5, CRC16, and PID errors.
Transmission Acknowledge.
When written, this register provides the PID and Endpoint information to the USB SIE engine used in the next transaction.
All 16 Endpoints can be addressed by the SL811HS.
Table 7. USB-A / USB-B Host PID and Device Endpoint Register when WRITTEN [Address 03h, 0Bh]
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PID3
PID2
PID1
PID0
EP3
EP2
EP1
EP0
PID[3:0]: 4-bit PID Field (See following table), EP[3:0]: 4-bit Endpoint Value in Binary.
PID TYPE
SETUP
IN
D7-D4
1101 (D Hex)
1001 (9 Hex)
0001 (1 Hex)
0101 (5 Hex)
1100 (C Hex)
1010 (A Hex)
1110 (E Hex)
0011 (3 Hex)
1011 (B Hex)
OUT
SOF
PREAMBLE
NAK
STALL
DATA0
DATA1
Document 38-08008 Rev. *F
Page 8 of 32
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