KSZ8841-16 Micrel Semiconductor, KSZ8841-16 Datasheet - Page 31

• Manufacturer Part Number: KSZ8841-16
• Description: Single-port Ethernet Mac Controller With Non-pci Interface
• Manufacturer: Micrel Semiconductor

BIU Implementati
Since KSZ8841M is an I/O device with 16 addressable locations, address decoding is based on the
AEN. Whenever DATACSN is asserted, the address decoder is disabled and a 32-bit transfer
assumed (BE3N – BE0N are ignored).
If address latching is required, the address is latched on the rising edge of ADSN and is transparent when ADSN=0.
November 2005
Micrel Confidential
1. Byte, word, and double word data buses and accesses (transfers)
2. Internal byte swapping is not implemented and word swapping is supported internally. Refer to Figure 10 for the
3. Since independent sets of synchronous and asynchronous signals are provided, synchronous and asynchronous
appropriate 8-bit, 16-bit, and 32-bit data bus connection.
cycles can be mixed or interleaved as long as they are not active simultaneously.
HA[15:2]
HD[7:0]
HA[1]
HA[0]
VDD
on Principles
EISA
VLBus
ISA
Figure 9. Mapping from the ISA, EISA, and VLBus to the KSZ8841M Bus Interface
8-bit Data Bus
A[1]
A[15:2]
D[7:0]
D[15:8]
BE0N
BE1N
Non-burst
KSZ8841-16
Burst
Figure 10. KSZ8841M 8-Bit, 16-Bit, and 32-Bit Data Bus Connections
HD[15:8]
HA[15:2]
Glue Logic
Glue Logic
Glue Logic
Glue Logic
HD[7:0]
nSBHE
HA[1]
HA[0]
(for example: ISA-like)
31
Note: To use DATACSN & 32-bit only for Central decode
16-bit Data Bus
A[
A
D[7:0]
D[15:8]
BE0N
BE1N
KSZ8841-16
[15:2]
1]
No Addr Latch
(ADSN = 0)
Address Latch
Address Latch
Central decode
Central decode
(VLBUSN = 1)
HD[23:16]
HD[31:24]
KSZ8841M BIU
are supported.
HD[15:8]
HA[15:2]
nHBE[0]
nHBE[1]
nHBE[2]
nHBE[3]
HD[7:0]
Local
decode
(VLBUSN = 0)
GND
Local
decode
(for example: EISA-like)
Asynchronous
Synchronous
32-bit Data Bus
Interface
Interface
KSZ8841-32
A[1]
A[15:2]
BE0N
BE1N
BE2N
BE3N
KSZ8841-16/32 MQL/MVL
D[7:0]
D[15:8]
D[23:16]
D[31:24]
values of A15-A4 and
to Data Register is
Rev 1.3