Chapter 7: User Flash Memory in MAX V Devices
7–5
UFM Functional Description
UFM Address Register
The MAX V UFM block is organized as a 512 × 16 memory. Because the UFM block is
organized into two sectors, the MSB of the address indicates the sector that is used; 0
is for sector 0 (UFM0) while 1 is for sector 1 (UFM1). An ERASEinstruction erases the
content of the specific sector that is indicated by the MSB of the address register.
Figure 7–2 shows the selection of the UFM sector using the MSB of the address
register.
For more information about the erase mode, refer to “Erase” on page 7–11.
Figure 7–2. Selection of the UFM Sector Using the MSB of the Address Register
Sector 0
Address Register
UFM Block
0
1
ARDin
A0
A1
A2
A3
A4
A5
A6
A7
A8
LSB
MSB
UFM Block
Sector 1
ARClk
Three control signals exist for the address register: ARSHFT, ARCLK, and ARDin. ARSHFTis
used as both a shift-enable control signal and an auto-increment signal. If the ARSHFT
signal is high, a rising edge on ARCLKloads address data serially from the ARDinport
and moves data serially through the register. A clock edge with the ARSHFTsignal low
increments the address register by 1. This implements an auto-increment of the
address to allow data streaming. When a program, read, or erase sequence is
executing, the address that is in the address register becomes the active UFM location.
January 2011 Altera Corporation
MAX V Device Handbook
ALTERA [ ALTERA CORPORATION ]
