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CHAPTER 7 REGISTERS
293
7.2 DIRECT ADDRESS REGISTERS
The address locations of the direct address registers can assume either of two modes: word address mode
or byte address mode. These modes can be selected by the SLM bit of the GMR register. Select a mode
suitable for the address decode method used by the system to be organized. In PCI mode, only byte address
mode can be used. Byte address mode is set automatically, regardless of the setting of the SLM bit.
(1) GMR (general mode register)
Address:
00H
Access mode: Read/write
The GMR register is mainly set by the host to select the operation mode of the
μ
PD98405 and to enable or
disable the transmission/reception function. The host sets this register first after the device has been reset.
Because this register sets the basic operation mode of the
μ
PD98405, do not change its contents once the
host has set the SE or RE bit of this register, at which point the
μ
PD98405 starts transmission and
reception. Otherwise, a malfunction may occur.
Bits 31 and 25 can be written. Set these bits to 0.
31
6
0
7
SZ
12
15
PLL
RA
SE
PC BPE DR
RE
BO
5
4
3
2
1
14
8
LP WA
AD
PM
11
13
16
CPE
24
25
26
27
28
29
30
17
SLM
TBE
0
PSM
0
UOC
ICM
UID
BBL
21
22
CFE
18
19
PHM
20
E64
EFM
Field
Function
Value after reset
0: Word address mode
SLM
Note
Sets the addressing of direct address register to either of two modes:
word or byte.
0: Word address mode (address W in Register Map)
1: Byte address mode (address B in Register Map)
This bit is valid only in Generic mode. In PCI mode, byte address
mode is set regardless of the setting of the SLM bit.
Unassigned/idle cell disable.
0: Transmits the unassigned/idle cells used for rate adjustment to
the PHY layer.
1: Disables the transmission of the unassigned/idle cells used for
rate adjustment. In all cases, unassigned/idle cells are not
transmitted to the PHY layer.
Idle cell mode.
0: Transmits unassigned cells as the cells used for rate adjustment.
1: Transmits idle cells as the cells used for rate adjustment. Those
cells that are transmitted by the unassigned cell generator
function also become idle cells.
Receive packet size notification mode, used for receive indication.
0: Performs notification in units of cells.
1: Performs notification using the Length field.
Notification in units of bytes is performed only for the user data
length. Error packet notification is performed in units of cells.
UID
0: Transmits the
unassigned/idle cells used
for rate adjustment
ICM
0: Transmits unassigned
cells
PSM
0: Notification is performed in
units of cells.
Note
This field is valid only in Generic mode.