EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 333

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Table 204. Pin to Boundary Scan Cell Mapping
PS019209-0504
Pin
TRIGOUT
TRIGOUT
TRIGOUT
HALT_SLP
BUSACK
BUSREQ
NMI
RESET
RESET_OUT
WAIT
INSTRD
Notes:
1. The address bits 0–7, 8–15, and 16–23 each share a single output enable. In this table, the output enables are
2. Direction on the data bus is controlled by a single output enable. It is shown in this table as being associated
3. MREQ,
shown to be associated with the least-significant bit that they control.
with D[0].
IORQ
Boundary Scan Cell Functionality
The boundary scan cells implemented are analogous to cell BC_1, defined in the
Standard VHDL Package STD_1149_1_2001.
All boundary scan cells are of the type control-and-observe; they provide both
controllability and observability for the pins to which they are connected. For
tristate outputs and bidirectional pins, this type includes controllability and observ-
ability of output enables.
Chain Sequence and Length
When enabled to shift data, the boundary scan shift register is connected to TDI
at the input line for TRIGOUT and to TDO at PD0. The shift register is arranged so
that data is shifted via the pins starting to the left of the OCI interface pins and pro-
ceeding clockwise around the chip. If a pin features multiple scannable bits (e.g.,
bidirectional pins or tristate output pins), the data is shifted first into the input sig-
nal, then the output, then the output enable (OEN).
The boundary scan register is 213 bits wide. Table 204 shows the ordering of bits
in the shift register, numbering them in clockwise order.
, INSTRDN, RD, and WR share an output enable; it is associated in this table with WR.
Direction
Output
Output
Output
Output
Output
Input
OEN
Input
Input
Input
Input
Scan Cell #
10
0
1
2
3
4
5
6
7
8
9
P R E L I M I N A R Y
Pin
MII_TxD2
MII_TxD3
MII_COL
MII_CRS
PA7
PA7
PA7
PA6
PA6
PA6
PA5
Direction
Output
Output
Output
Output
Product Specification
Input
Input
Input
OEN
Input
OEN
Input
On-Chip Instrumentation
eZ80F91 MCU
Scan Cell #
107
108
109
110
112
113
114
115
116
117
111
314