isp1181 NXP Semiconductors, isp1181 Datasheet - Page 38

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

Philips Semiconductors
9397 750 08938
Product data
12.3.2 Unlock Device
Table 37:
Table 38:
This command unlocks the ISP1181 from write-protection mode after a ‘resume’. In
‘suspend’ state all registers and FIFOs are write-protected to prevent data corruption
by external devices during a ‘resume’. Register access for reading is not blocked.
After waking up from ‘suspend’ state, the firmware must unlock the registers and
FIFOs via this command, by writing the unlock code (AA37H) into the Lock Register
(8-bit bus: lower byte first). The bit allocation of the Lock Register is given in
Code (Hex): B0 — unlock the device
Transaction — write 2 bytes (unlock code)
Bit
7
6
5
4 to 1
0
Error code
(Binary)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Transaction error codes
Error Code Register: bit description
Symbol
UNREAD
DATA01
-
ERROR[3:0]
RTOK
Description
no error
PID encoding error; bits 7 to 4 are not the inverse of bits 3 to 0
PID unknown; encoding is valid, but PID does not exist
unexpected packet; packet is not of the expected type (token, data, or
acknowledge), or is a SETUP token to a non-control endpoint
token CRC error
data CRC error
time-out error
babble error
unexpected end-of-packet
sent or received NAK (Not AcKnowledge)
sent Stall; a token was received, but the endpoint was stalled
overflow; the received packet was larger than the available buffer space
sent empty packet (ISO only)
bit stuffing error
sync error
wrong (unexpected) toggle bit in DATA PID; data was ignored
Rev. 04 — 30 October 2001
Description
A logic 1 indicates that a new event occurred before the
previous status was read.
This bit indicates the PID type of the last successfully received
or transmitted packet (0 = DATA0 PID, 1 = DATA1 PID).
reserved
Error code. For error description, see
A logic 1 indicates that data was received or transmitted
successfully.
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
Full-speed USB interface
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38.
ISP1181
Table
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