ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 433

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

Preliminary
15.4: NPBUS EPROM Address/Command Register
Used to accessed a maximum of 2K external serial EPROM or 16 Meg of parallel EPROM or the Sonet
Framer Core. This register is used access bytes from the external EPROM or the Sonet Framer Core.
Length
Type
Address
Power On Value
Restrictions
pnr25.chapt05.01
August 14, 2000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31-30
Bit(s)
23-0
29
28
27
26
25
24
Reserved
Framer Access: Not read/Write
Execute Sonet Framer Access
Execute Parallel EPROM Access
More bytes to Read/Write Serial
EPROM
Not Read/Write
Execute Serial EPROM Access
EPROM/Extended PHY Address
Name
32 bits
Read/Write
XXXX 2010
X’00000100’
None
Reserved.
This bit set to ’1’ will cause a write function to the Sonet Framer Core. This bit set to ’0’
will cause a read function to the Sonet Framer Core.
This bit will start a read or write function to the Sonet Framer Core. This bit will auto
reset after the command is issued.
This bit will start a read or write function to the parallel EPROM. This bit will auto reset
after the command is issued.
This bit set to ’1’ will help speed up sequential accesses to the serial EPROM. If writ-
ing, there is a limit as to how many bytes can be written before the serial EPROM write
buffer is full. Typical range is from two to eight bytes, depending on the device.
This bit set to ’1’ will cause a write function to the serial/parallel EPROM. This bit set to
’0’ will cause a read function to the serial/parallel EPROM.
This bit will start a read or write function to the serial EPROM. This bit will auto reset
after the command is issued.
This holds the address field that will be used to address the serial/parallel EPROM. It
is also where the 15 - 8 address bits will be held if addressing a PHY with more
addressability than eight bits.
EPROM/Extended PHY Address
Nodal Processor Bus Interface (NPBUS)/CRISCO Processor for
Description
IBM Processor for Network Resources
9
Register Initialization from EPROM Data
8
7
6
5
4
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