5.7.2 Host-I/F registers details
5.7.2.1
HOSTSTATUS - Host-I/F status register
This register holds various status information.
Access
This register can be read in 8-bit, 16-bit and 32-bit units.
If this register is read in 16-bit or 32-bit units the upper bits 15 to 8, respectively
31 to 8, return undefined values.
Address
00000000
H
Initial Value
0000 002A
H
. This register is initialized by any reset.
7
6
5
4
3
2
1
0
CIFNRDY
DREQ
INTA
INTB
AHBM
RDY
0
1
0
R
R
R
R
R
R
R
R
Bit
Bit name
Function
7
CIFNRDY
Host-I/F not ready
0 Host-I/F is in operation
1 Host-I/F and Ravin-M in reset state
6
DREQ
Status of HLBDRQ pin
0 HLBDRQ is active
1 HLBDRQ is inactive
5
INTA
Group A interrupt status
0 no group A interrupt pending
1 group A interrupt pending
INTA = 1 indicates that at least one of the group A interrupts is pending.
4
INTB
Group B interrupt status
0 no group B interrupt pending
1 group B interrupt pending
INTB = 1 indicates that at least one of the group B interrupts is pending.
3
AHBMRDY
AHBM ready
0 AHBM is busy – no access to AHBM address range allowed
1 AHBM is ready to receive the next access
Chapter 5
Host CPU Interface
144
Preliminary User's Manual S19203EE1V3UM00
Содержание uPD72257
Страница 39: ...Pin Functions Chapter 2 Preliminary User s Manual S19203EE1V3UM00 39...
Страница 44: ...Chapter 2 Pin Functions 44 Preliminary User s Manual S19203EE1V3UM00...
Страница 46: ...Chapter 2 Pin Functions 46 Preliminary User s Manual S19203EE1V3UM00...
Страница 49: ...Pin Functions Chapter 2 Preliminary User s Manual S19203EE1V3UM00 49...
Страница 52: ...Chapter 2 Pin Functions 52 Preliminary User s Manual S19203EE1V3UM00...
Страница 54: ...Chapter 2 Pin Functions 54 Preliminary User s Manual S19203EE1V3UM00...
Страница 331: ...External Memory Interface Controller Chapter 9 Preliminary User s Manual S19203EE1V3UM00 331...
Страница 343: ......