LPC47N237-MD SMSC [SMSC Corporation], LPC47N237-MD Datasheet - Page 87

• Manufacturer Part Number: LPC47N237-MD
• Description: 3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS
• Manufacturer: SMSC [SMSC Corporation]

3.3v I/O Controller for Port Replicators and Docking Stations
SMSC DS – LPC47N237
State description :
S0: GPIO pin low, no transition.
S1: GPIO pin transitions from low to high. GPIO data bit changes state to ‘1’. Sets GPIO Change Status
bit, asserts interrupt.
S2: Read of data register clears GPIO Change Status bit, deasserts interrupt. Note: The nSMBINT pin is
cleared when there are no bits set in the GPIO Change Status Register.
S3: GPIO pin transitions from high to low. GPIO data bit changes state to ‘0’. Sets GPIO Change Status
bit, asserts interrupt.
S4: GPIO pin transitions from low to high. GPIO data bit changes state, nSMBINT remains active.
S5: Read of data register clears GPIO Change Status bit, deasserts interrupt. Note: The nSMBINT pin is
cleared when there are no bits set in the GPIO Change Status Register.
S6: Mask bit is set. No effect on change status bit or interrupt.
S7: GPIO pin transitions from high to low while GPIO is masked. GPIO data bit changes state to ‘0’. No
effect on change status bit or interrupt.
S8: Mask bit is cleared. No effect on change status bit or interrupt.
S9: GPIO in output mode. Change in GPx pin does not effect GPIO data bit for input. Change status bit
will not be set and interrupt will not go active regardless of mask bit.
Figure 15.3 shows a representation of the nSMBINT assertion logic. It is not intended to imply a specific
logic design.
DATASHEET
Page 87
Revision 0.3 (10-26-04)