Preliminary
PowerNP NPe405L Embedded Processor Data Sheet
Signal Functional Description (Part 4 of 6)
Notes:
1. Receiver input has hysteresis.
2. Must pull up. See “Pull-up and Pull-down Resistors” on page 30 for recommended termination values.
3. Must pull down. See “Pull-up and Pull-down Resistors” on page 30 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 31.
Signal Name
Description
I/O
Type
Notes
DMA request. Used by peripherals to request a data
transfer. Following a system reset, the default mode of the
signals is active-low. They may be programmed to active-
high using the DMA0_POL register.
5V tolerant
3.3V LVTTL
[DMAReq0:3]
I
1
DMA acknowledge. Used to indicate to peripherals that
data transfer is complete. Following a system reset, the
default mode of the signals is active-low. They may be
programmed to active-high using the DMA0_POL register.
5V tolerant
3.3V LVTTL
[DMAAck0:3]
O
End Of Transfer/Terminal Count. Indication by peripherals
that all data has been transfered, or by DMA controller that
programmed amount of data has been transfered.
Following a system reset, the default mode of the signals is
active-low. They may be programmed to active-high using
the DMA0_POL register.
5V tolerant
3.3V LVTTL
[EOT0:3/TC0:3]
I/O
1
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
35
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
