Solvline Eddy DKV2.1.0.3 - Manual (Page 39)

Chapter 3. Development
Environment
39
A21 ALE
ADDRESS LATCH ENABLE
The ALE input controls the activating path for
address to the internal address registers.
OUT
NANDOE NANDOE data-out control OUT
NANDWE NANDWE controls writes to the I/O port OUT
PC14(NCS3) NANDCS device selection control OUT
PC17
RDYBSY
(R/B)
READY/BUSY OUTPUT
The R/B output indicates the status of the device
operation. When low, it indicates that a program,
erase or random read operation is in process and
returns to high state upon completion. It is an
open drain output and
does not float to high-z condition when the chip
is deselected or when outputs are disabled.
IN
D[0:7]
DATA
bits
DATA INPUTS/OUTPUTS
The I/O pins are used to input command,
address and data, and to output data during read
operations. The I/O pins float to high-z when the
chip is deselected or when the outputs are
disabled.
I/O
2.4.5.8. Ethernet Controller (WAN Port)
- Davicom DM9000B Ethernet Controller
- 16 bit mode set.
- EECS pin should be connected with pull-up resistor to use link/speed LED.
- RJ45 Transformer Center Tap is powered by DM9000B AVDD18.
Eddy-CPU v2.1
Signal Name
DM9000B
Signal Name
Description I/O
PC12/NCS7 CSN
Chip Select #7
Address : 0x8000 0000-0x8FFF FFFF
OUT
PC15/IRQ1 INTRN
Interrupt depend on EECK(pin20) setting.
1 : INT pin low active
0 : INT pin high active
EECK is not connected in DK board, so Interrupt is
acted with active high.
IN
A2 CMD
Command Type
When high, Data port
When low, INDEX port
OUT
D[0:15] Data Bus 16-bit mode I/O