CY7C63723-SXCT Cypress Semiconductor Corp, CY7C63723-SXCT Datasheet - Page 32

• Manufacturer Part Number: CY7C63723-SXCT
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C63723-SXCT

• Lead Free Status / RoHS Status: Compliant

Bit 0: USB Bus Reset - PS/2 Interrupt Enable
Figure 35. Endpoint Interrupt Enable Register
(Address 0x21)
Bit [7:3]: Reserved.
Document #: 38-08022 Rev. *D
Read/Write - - - - -
Bit Name
The function of this interrupt is selectable between detection
of either a USB bus reset condition, or PS/2 activity. The se-
lection is made with the USB-PS/2 Interrupt Mode bit in the
USB Status and Control Register (Figure 14). In either case,
the interrupt will occur if the selected condition exists for 256
μs, and may occur as early as 128 μs.
A USB bus reset is indicated by a single ended zero (SE0) on
the USB D+ and D– pins. The USB Bus Reset interrupt occurs
when the SE0 condition ends. PS/2 activity is indicated by a
continuous LOW on the SDATA pin. The PS/2 interrupt occurs
as soon as the long LOW state is detected.
During the entire interval of a USB Bus Reset or PS/2 interrupt
event, the USB Device Address register is cleared.
The Bus Reset/PS/2 interrupt may occur 128 μs after the bus
condition is removed.
1 = Enable
0 = Disable
Reset
Bit #
7 6 5 4 3
0 0 0 0 0
Reserved
Interrupt
Enable
EP2
R/W
2
0
Interrupt
Enable
EP1
R/W
1
0
Interrupt
Enable
EP0
R/W
0
0
Bit [2:1]: EP2,1 Interrupt Enable
Refer to
Bit 0: EP0 Interrupt Enable
❐
❐
❐
❐
❐
❐
❐
❐
❐
There are two non-control endpoint (EP2 and EP1) interrupts.
If enabled, a non-control endpoint interrupt is generated
when:
1 = Enable
0 = Disable
If enabled, a control endpoint interrupt is generated when:
1 = Enable EP0 interrupt
0 = Disable EP0 interrupt
The USB host writes valid data to an endpoint FIFO. Howev-
er, if the endpoint is in ACK OUT modes, an interrupt is gen-
erated regardless of data packet validity (i.e., good CRC).
Firmware must check for data validity.
The device SIE sends a NAK or STALL handshake packet
to the USB host during the host attempts to read data from
the endpoint (INs).
The device receives an ACK handshake after a successful
read transaction (IN) from the host.
The device SIE sends a NAK or STALL handshake packet
to the USB host during the host attempts to write data (OUTs)
to the endpoint FIFO.
The endpoint 0 mode is set to accept a SETUP token.
After the SIE sends a 0-byte packet in the status stage of a
control transfer.
The USB host writes valid data to an endpoint FIFO. Howev-
er, if the endpoint is in ACK OUT modes, an interrupt is gen-
erated regardless of what data is received. Firmware must
check for data validity.
The device SIE sends a NAK or STALL handshake packet
to the USB host during the host attempts to read data from
the endpoint (INs).
The device SIE sends a NAK or STALL handshake packet
to the USB host during the host attempts to write data (OUTs)
to the endpoint FIFO.
Table 8
for more information.
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