EZ80190AZ050SC00TR Zilog, EZ80190AZ050SC00TR Datasheet - Page 160

• Manufacturer Part Number: EZ80190AZ050SC00TR
• Description: IC EZ80 ACCLAIM 50MHZ 100LQFP
• Manufacturer: Zilog

Specifications of EZ80190AZ050SC00TR

• Processor Type: eZ80
• Features: High Speed, Single-Cycle Instruction-Fetch
• Speed: 50MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ZDI Register Addressing
PS006614-1208
ZDI Single-Bit Byte Separator
ZCL
ZDA
Following each 8-bit ZDI data transfer, a single-bit byte separator is used. The ZDA pin
should be forced High (1) prior to the ZCL rising edge for this 9
ations, the ZDI register address automatically increments during this single-bit byte sepa-
rator period. The same read or write operation as just completed can then be immediately
performed on the next ZDI register. If a different operation or register address is required,
a ZDI START signal during the byte separator bit can be used to terminate the previous
read or write operation and signify initiation of a new ZDI register operation.
Following a START signal, the ZDI master must output the ZDI register address. All data
transfers with the ZDI block use special ZDI registers. The ZDI control registers that
reside in the ZDI register address space should not be confused with the eZ80190 device
peripheral registers that reside in the I/O addressing space of the eZ80190 device.
Many locations in the ZDI control register address space are shared by two registers, one
for Read Only access and one for Write Only access. As an example, a read from ZDI reg-
ister address
00h
points.
The format for a ZDI address is seven bits of address, followed by one bit for read or write
control, and completed by a single-bit byte separator in which ZDA must be 1. The data
separator time period is used to allow the ZDI master to send a new ZDI START signal, if
necessary. The ZDI executes a read or write operation depending on the state of the R/W
bit (0 = write, 1 = read).
Signal
Start
, stores the Low byte of one of the address match values used for generating break
S
msb
00h
A6
1
returns the Product ID Low Byte while a write to this same location,
A5
2
Figure 30
Figure 30. ZDI Address Write Timing
A4
3
ZDI Address Byte
displays the timing for address writes to ZDI registers.
A3
4
A2
5
A1
6
A0
lsb
7
0 = write
1 = read
R/W
th
Product Specification
8
bit. For most ZDI oper-
Byte Separator
START Signal
or new ZDI
Single-Bit
Zilog Debug Interface
1
9
eZ80190
150