CY7C67300
Register Description
The Host n PID register is a write only register that provides the PID and Endpoint information to the USB SIE to be used in the next transaction.
PID Select (Bits [7:4])
The PID Select field is defined in Table 54. ACK and NAK tokens are automatically sent based on settings in the Host n Control register and do not need to be written in this register.
Table 54. PID Select Definition
PID TYPE | PID Select [7:4] |
SETUP | 1101 (D Hex) |
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IN | 1001 (9 Hex) |
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OUT | 0001 (1 Hex) |
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SOF | 0101 (5 Hex) |
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PREAMBLE | 1100 (C Hex) |
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NAK | 1010 (A Hex) |
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STALL | 1110 (E Hex) |
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DATA0 | 0011 (3 Hex) |
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DATA1 | 1011 (B Hex) |
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Host n Count Result Register [R]
■Host 1 Count Result Register 0xC088
■Host 2 Count Result Register 0xC0A8
Table 55. Host n Count Result Register
Endpoint Select (Bits [3:0])
The Endpoint field allows addressing of up to 16 different endpoints.
Reserved
Write all reserved bits with ’0’.
Bit # | 15 | 14 | 13 | 12 |
| 11 | 10 | 9 | 8 |
Field |
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| Result... |
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Read/Write | R | R | R | R |
| R | R | R | R |
Default | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 |
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Bit # | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
Field |
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| ...Result |
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Read/Write | R | R | R | R |
| R | R | R | R |
Default | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 |
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Register Description
The Host n Count Result register is a read only register that contains the size difference in bytes between the Host Count Value specified in the Host n Count register and the last packet received. If an overflow or underflow condition occurs, that is the received packet length differs from the value specified in the Host n Count register, the Length Exception Flag bit in the Host n Endpoint Status register is set. The value in this register is only value when the Length Exception Flag bit is set and the Error Flag bit is not set, both bits are in the Host n Endpoint Status register.
Result (Bits [15:0])
The Result field contains the differences in bytes between the received packet and the value specified in the Host n Count register. If an overflow condition occurs, Result [15:10] is set to ‘111111’, a 2’s complement value indicating the additional byte count of the received packet. If an underflow condition occurs, Result [15:0] indicates the excess bytes count (number of bytes not used).
Reserved
Write all reserved bits with ’0’.
Document #: | Page 33 of 99 |
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