Renesas NU85E Preliminary User's Manual page 33

(9) VMBENZ3 to VMBENZ0 (output), VSBENZ1 (input)
These are low-level active pins that indicate the enabled byte data out of the four data bus (VBDI31 to VBDI0,
VBDO31 to VBDO0) parts.
The NU85E uses the VMBENZ3 to VMBENZ0 pins when it has the bus access right, and the VSBENZ1 pin for
the bus bridge (BBR) to generate the VPUBENZ signal when it operates as bus slave.
Active (Low Level) Signal
VMBENZ3
VMBENZ2
VMBENZ1, VSBENZ1
VMBENZ0
(10) VMSIZE1, VMSIZE0 (output)
These are pins that output the data transfer size when the NU85E has the bus access right.
Remark 0: low-level 1: high-level
(11) VMWRITE (output), VSWRITE (input)
These are pins that indicate the data transfer direction (read/write status). They become high level during write
access.
The NU85E uses the VMWRITE pin when it has the bus access right, and the VSWRITE pin when it operates as
a bus slave.
(12) VMLOCK (output), VSLOCK (input)
These pins are used to retain the bus access right. These pins are used to prohibit interruption through access
from another bus master between the current transfer and the next transfer.
The NU85E uses the VMLOCK pin when it has the bus access right, and the VSLOCK pin when it operates as a
bus slave.
CHAPTER 2 PIN FUNCTIONS
Table 2-2. VMBENZ3 to VMBENZ0 and VSBENZ1 Signals
Table 2-3. VMSIZE1 and VMSIZE0 Signals
VMSIZE1 VMSIZE0
0 0 Byte (8 bits)
0 1 Halfword (16 bits)
1 0 Word (32 bits)
1 1 (Reserved for future function expansion)
Preliminary User's Manual A14874EJ3V0UM
Enabled Byte Data
VBDI31 to VBDI24, VBDO31 to VBDO24
VBDI23 to VBDI16, VBDO23 to VBDO16
VBDI15 to VBDI8, VBDO15 to VBDO8
VBDI7 to VBDI0, VBDO7 to VBDO0
Data Transfer Size
31