ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 272

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 151. Pin to Boundary Scan Cell Mapping
PS027001-0707
Pin
TRIGOUT
TRIGOUT
TRIGOUT
HALT_SLP
BUSACK
BUSREQ
NMI
RESET
RESET_OUT
WAIT
INSTRD
WR
WR
RD
MREQ
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 controlla-
bility and observability for the pins to which they are connected. For open-drain outputs
and bidirectional pins, this type includes controllability and observability 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 proceeding clockwise
around the chip. If a pin features multiple scannable bits (example: bidirectional pins or
open-drain output pins), the data is shifted first into the input signal, then the output, then
the output enable (OEN).
The boundary scan register is 213 bits wide.
shift register, numbering them in clockwise order.
Direction
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
OEN
OEN
Scan Cell No
10
12
13
14
11
0
1
2
3
4
5
6
7
8
9
Pin
MII_TxD2
MII_TxD3
MII_COL
MII_CRS
PA7
PA7
PA7
PA6
PA6
PA6
PA5
PA5
PA5
PA4
PA4
Table 151
shows the ordering of bits in the
Direction
Output
Output
Output
Output
Output
Output
Product Specification
Input
Input
Input
Input
Input
Input
OEN
OEN
OEN
On-Chip Instrumentation
eZ80F91 ASSP
Scan Cell No
107
109
120
121
108
110
112
113
114
115
116
117
118
119
111
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