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KM416RD16C Datasheet(PDF) 11 Page - Samsung semiconductor |
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KM416RD16C Datasheet(HTML) 11 Page - Samsung semiconductor |
11 / 64 page Page 8 KM416RD8AC(D)/KM418RD8AC(D) Direct RDRAM™ Rev. 1.01 Oct. 1999 Field Encoding Summary Table 6 shows how the six device address bits are decoded for the ROWA and ROWR packets. The DR4T and DR4F encoding merges a fifth device bit with a framing bit. When neither bit is asserted, the device is not selected. Note that a broadcast operation is indicated when both bits are set. Broadcast operation would typically be used for refresh and power management commands. If the device is selected, the DM (DeviceMatch) signal is asserted and an ACT or ROP command is performed. Table 7 shows the encodings of the remaining fields of the ROWA and ROWR packets. An ROWA packet is specified by asserting the AV bit. This causes the specified row of the specified bank of this device to be loaded into the associated sense amps. An ROWR packet is specified when AV is not asserted. An 11 bit opcode field encodes a command for one of the banks of this device. The PRER command causes a bank and its two associated sense amps to precharge, so another row or an adjacent bank may be activated. The REFA (refresh-acti- vate) command is similar to the ACT command, except the row address comes from an internal register REFR, and REFR is incremented at the largest bank address. The REFP (refresh-precharge) command is identical to a PRER command. The NAPR, NAPRC, PDNR, ATTN, and RLXR commands are used for managing the power dissipation of the RDRAM and are described in more detail in “ Power state manage- ment “ on page 38. The TCEN and TCAL commands are used to adjust the output driver slew rate and they are described in more detail in “Current and Temperature Control“ on page 43. Table 6: Device Field Encodings for ROWA Packet and ROWR Packet DR4T DR4F Device Selection Device Match signal (DM) 1 1 All devices (broadcast) DM is set to 1 0 1 One device selected DM is set to 1 if {DEVID4..DEVID0} == {0,DR3..DR0} else DM is set to 0 1 0 One device selected DM is set to 1 if {DEVID4..DEVID0} == {1,DR3..DR0} else DM is set to 0 0 0 No packet present DM is set to 0 Table 7: ROWA Packet and ROWR Packet Field Encodings DMa AV ROP10..ROP0 Field Name Command Description 10 9 8 7 6 5 4 3 2:0 0 - - - - - - - - - --- - No operation. 1 1 Row address ACT Activate row R8..R0 of bank BR4..BR0 of device and move device to ATTNb. 1 0 1 1 0 0 0 xc x x 000 PRER Precharge bank BR4..BR0 of this device. 1 0 0 0 0 1 1 0 0 x 000 REFA Refresh (activate) row REFR8..REFR0 of bank BR4..BR0 of device. Increment REFR if BR4..BR0 = 1111 (see Figure 50). 1 0 1 0 1 0 1 0 0 x 000 REFP Precharge bank BR4..BR0 of this device after REFA (see Figure 50). 1 0 x x 0 0 0 0 1 x 000 PDNR Move this device into the powerdown (PDN) power state (see Figure 47). 1 0 x x 0 0 0 1 0 x 000 NAPR Move this device into the nap (NAP) power state (see Figure 47). 1 0 x x 0 0 0 1 1 x 000 NAPRC Move this device into the nap (NAP) power state conditionally 1 0 x x x x x x x 0 000 ATTNb Move this device into the attention (ATTN) power state (see Figure 45). 1 0 x x x x x x x 1 000 RLXR Move this device into the standby (STBY) power state (see Figure 46). 1 0 0 0 0 0 0 0 0 x 001 TCAL Temperature calibrate this device (see Figure 52). 1 0 0 0 0 0 0 0 0 x 010 TCEN Temperature calibrate/enable this device (see Figure 52). 1 0 0 0 0 0 0 0 0 0 000 NOROP No operation. a. The DM (Device Match signal) value is determined by the DR4T,DR4F, DR3..DR0 field of the ROWA and ROWR packets. See Table 6. b. The ATTN command does not cause a RLX-to-ATTN transition for a broadcast operation (DR4T/DR4F=1/1). c. An “x“ entry indicates which commands may be combined. For instance, the three commands PRER/NAPRC/RLXR may be specified in one ROP value (011000111000). |
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