Revision 1.01 – April 18, 2007
NPe405H – PowerNP NPe405H Embedded Processor
Data Sheet
Table 6. Signal Functional Description (Sheet 7 of 9)
Notes:
1. Receiver input has hysteresis.
2. Must pull up. See “Pull-up and Pull-down Resistors” on page 42 for recommended termination values.
3. Must pull down. See “Pull-up and Pull-down Resistors” on page 42 for recommended termination values.
4. If not used, must pull up.
5. If not used, must pull down.
6. Strapping input during reset; pull up or pull down as required.
7. Pull-up may be required. See “External Peripheral Bus Control Signals” on page 42.
Signal Name
Description
I/O
Type
Notes
External Master Peripheral Interface
Peripheral Reset. Used by an external master and
synchronous peripheral slaves.
5V tolerant
3.3V LVTTL
ExtReset
HoldReq
HoldAck
ExtReq
ExtAck
O
I
Hold Request. Used by an external master to request
ownership of the peripheral bus.
5V tolerant
3.3V LVTTL
1, 5
6
Hold Acknowledge. Used by the NPe405H to transfer
ownership of peripheral bus to an external master.
5V tolerant
3.3V LVTTL
O
I
External Request. Used by an external master to indicate it is
prepared to transfer data.
5V tolerant
3.3V LVTTL
1
External Acknowledgement. Used by the NPe405H to
indicate that a data transfer occurred.
5V tolerant
3.3V LVTTL
O
I
6
Hold Primary. Used by an external master to indicate the
priority of a given transfer (0 = high, 1 = low).
5V tolerant
3.3V LVTTL
HoldPri
1
Bus Request. Used when the NPe405H needs to regain
control of peripheral interface from an external Master.
5V tolerant
3.3V LVTTL
BusReq
O
Internal Peripheral Interface
Serial Clock used to provide an alternative clock to the
internally generated serial clock. Used in cases where the
allowable internally generated baud rates are not satisfactory.
This input can be individually connected to either or both
UART0 and UART1.
5V tolerant
3.3V LVTTL
UARTSerClk
I
1
1
5V tolerant
3.3V LVTTL
UART0_Rx
UART0_Tx
UART0 Receive data.
I
O
I
5V tolerant
3.3V LVTTL
UART0 Transmit data.
5V tolerant
3.3V LVTTL
[UART0_DCD]
[UART0_DSR]
[UART0_CTS]
[UART0_DTR]
[UART0_RTS]
[UART0_RI]
UART0 Data Carrier Detect.
UART0 Data Set Ready.
UART0 Clear To Send.
UART0 Data Terminal Ready.
UART0 Request To Send.
UART0 Ring Indicator.
1
1
1
5V tolerant
3.3V LVTTL
I
5V tolerant
3.3V LVTTL
I
5V tolerant
3.3V LVTTL
O
O
I
5V tolerant
3.3V LVTTL
5V tolerant
3.3V LVTTL r
1
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DS2011
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