Specifications

CY7C67200
Document Number: 38-08014 Rev. *J Page 24 of 93
Host n Count Register [R/W]
■ Host 1 Count Register 0xC084
■ Host 2 Count Register 0xC0A4
Figure 20. Host n Count Register
Register Description
The Host n Count register is used to hold the number of bytes
(packet length) for the current transaction. The maximum packet
length is 1023 bytes in ISO mode. The Host Count value is used
to determine how many bytes to transmit, or the maximum
number of bytes to receive. If the number of received bytes is
greater then the Host Count value then an overflow condition will
be flagged by the Overflow bit in the Host n Endpoint Status
register.
Count (Bits [9:0])
The Count field sets the value for the current transaction data
packet length. This value is retained when switching between
host and device mode, and back again.
Reserved
All reserved bits must be written as ‘0’.
Host n Endpoint Status Register [R]
■ Host 1 Endpoint Status Register 0xC086
■ Host 2 Endpoint Status Register 0xC0A6
Figure 21. Host n Endpoint Status Register
Register Description
The Host n Endpoint Status register is a read-only register that
provides status for the last USB transaction.
Overflow Flag (Bit 11)
The Overflow Flag bit indicates that the received data in the last
data transaction exceeded the maximum length specified in the
Host n Count Register. The Overflow Flag should be checked in
response to a Length Exception signified by the Length
Exception Flag set to ‘1’.
1: Overflow condition occurred
0: Overflow condition did not occur
Underflow Flag (Bit 10)
The Underflow Flag bit indicates that the received data in the last
data transaction was less then the maximum length specified in
the Host n Count register. The Underflow Flag should be
checked in response to a Length Exception signified by the
Length Exception Flag set to ‘1’.
1: Underflow condition occurred
0: Underflow condition did not occur
Bit # 15 14 13 12 11 10 9 8
Field Reserved Count...
Read/Write - - - - - - R/W R/W
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Field ...Count
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Default 0 0 0 0 0 0 0 0
Bit # 15 14 13 12 11 10 9 8
Field
Reserved Overflow
Flag
Underflow
Flag
Reserved
Read/Write - - - - R R - -
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Field
Stall
Flag
NAK
Flag
Length
Exception
Flag
Reserved Sequence
Status
Timeout
Flag
Error
Flag
ACK
Flag
Read/Write R R R - R R R R
Default 0 0 0 0 0 0 0 0