ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 71

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

Random Access Memory
PS006613-0306
000000h
7ADFFFh
7ADC00h
FFFFFFh
7AFFFFh
7AE000h
Location
Memory
The eZ80190 device features an 8 KB x 8 single-port data Random Access Mem-
ory (RAM) for general-purpose use and a 1 KB x 8 dual-port static RAM for use
with the Multiply-Accumulator unit. Both RAM spaces can be individually enabled
or disabled, and can be relocated to the top of any 64 KB page in memory. Data is
passed to and from the two RAM spaces via the 8-bit data bus, DATA[7:0]. The
dual-port MACC RAM can be used with the Multiply-Accumulator or as additional
general-purpose RAM, if required. For details about using the MACC RAM with
the Multiply-Accumulator, see
The general-purpose data RAM occupies the memory addresses range
{RAM_ADDR_U[7:0],
mulator dual-port RAM occupies the address range {RAM_ADDR_U[7:0],
to {RAM_ADDR_U[7:0],
on-chip RAM spaces is illustrated in
Upper Byte register, RAM_ADDR_U, is set to
as RAM memories occupy only a very small fraction of the available 16 MB
address space.
When enabled, on-chip RAM assumes priority over all Memory Chip Selects that
may also be enabled in the same address space. If an address is generated in a
Figure 10. On-Chip RAM Memory Addressing Example
General-Purpose
1KB MACC RAM
RAM
8KB
E000h
DFFFh
PRELIMINARY
} to {RAM_ADDR_U[7:0],
RAM_ADDR_U
MACC RAM
}. An example of the memory mapping for the two
7Ah
Figure
on page 122.
10. In this example, the RAM Address
7Ah
eZ80190 Product Specification
.
Figure 10
FFFFh
is not drawn to scale,
}. The Multiply-Accu-
Random Access Memory
DC00h
}
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