NEC Network Controller uPD98502 - Manual (Page 190)

CHAPTER 3 SYSTEM CONTROLLER
190 Preliminary User’s Manual S15543EJ1V0UM
Offset Address Register Name R/W Access Description
1000_00D8H MACAR1 R W/H/B MAC Address Register 1
1000_00DCH MACAR2 R W/H/B MAC Address Register 2
1000_00E0H MACAR3 R W/H/B MAC Address Register 3
1000_00E4H:
1000_00FCH
N/A - - Reserved for future use
1000_0100H RMMDR R/W W Boot ROM Mode Register
1000_0104H RMATR R/W W Boot ROM Access Timing Register
1000_0108H SDMDR R/W W SDRAM Mode Register
1000_010CH SDTSR R/W W SDRAM Type Selection Register
1000_0110H SDPTR R/W W SDRAM Precharge Timing Register
1000_0114H:
1000_0118H
N/A - - Reserved for future use
1000_011CH SDRMR R/W W SDRAM Refresh Mode Register
1000_0120H SDRCR R W SDRAM Refresh Timer Count Register
1000_0124H MBCR R/W W Memory Bus Control Register
1000_0128H:
1000_0FFCH
N/A - - Reserved for future use
Remarks 1. In the “R/W” field,
“W” means “writeable”,
“R” means “readable”,
“RC” means “read-cleared”,
“- “ means “not accessible”.
2. All internal registers are 32-bit word-aligned registers.
3. The burst access to the internal register is prohibited.
If such burst access has been occurred, IRERR bit in NSR is set and NMI will assert to CPU.
4. Read access to the reserved area will set the CBERR bit in the NSR register and the dummy read
response data with the data-error bit set on SysCMD [0] is returned.
5. Write access to the reserved area will set the CBERR bit in the NSR register, and the write data is lost.
6. In the “Access” filed,
“W” means that word access is valid,
“H” means that half word access is valid,
“B” means that byte access is valid.
7. Write access to the read-only register cause no error, but the write data is lost.
8. The CPU can access all internal registers, but IBUS master device cannot access them.